this is going to be a bit long, because your question is not one that can be answered in 1 or 2 sentences. so i just wanted to let you know that...
well, first off, a true prophet of God does not prophesy for money... so that's a big red flag. that would sort of make God into some sort of prostitute, wouldn't it? i mean, to say that He'd give u a word if you gave Him money? so a real prophet would never ask for money in order to give you a word from the Lord. if God has truly given them a word for you, then they'll give it for free, because freely they have received so freely they ought to give. did God charge them money for the word that He's given them for you?
now, there are some prophets that are in training so they are more prone to make mistakes. and we must also remember that prophets are not infallible... only the Word is. so when God gives them a word for someone, that word must be filtered through that person's character/personality... you see what i'm saying here? it is possible even for a real prophet of God to "miss it" as they say. we often make the mistake of assuming that prophets don't ever mistakes, and that's not true. they're still human, so they are still capable of making mistakes, so we are to always check the word that they give with the Word of God. it MUST line up with the Word... if it's not in agreement with the Word then it did not come from God. The Bible says that the Word is God, so God would never contradict Himself in ANYTHING. it's just not possible. so sometimes a prophet may have heard wrong. it's not that they're a false prophet, but just that they "missed it" somewhere
now that is not to say that they are suppose to "miss it" every single time they give a word... if they're missing it all the time, then it's time for them to sit down somewhere until God really speaks to them... something wouldn't be right with that picture... God is not speaking to you ALL the time, and when you make that mistake then you end up giving false prophecies, which would give a person right to label you as a false prophet. u can't assume that everytime you open your mouth, God wants to speak into someone's life... c'mon now. God doesn't always want a prophet to speak even when He has shown them something. sometimes He reveals things just for the purpose of intercession. but that's another topic.
now there are 3 things that are supposed to be present in ALL prophecies. i always remember them because they all start with the letter "e", so maybe that would help u 2 remember so you can discern. but those 3 things are:
1. edification - does it build you up in the LORD and in the things of God?
2. exhortation - does it provoke you to get to know God and truly seek Him in spirit and in truth or does it draw you away from the Lord? if a prophetic word has come from the Lord, it will always lead you closer to the Lord
3. encouragement - does it give courage to go on in God? letting you know that God is concerned about you and that you CAN make it?
now if 1 of these 3 things are not present in the word they give you, then please do not receive it.
another way to tell, and i believe someone has already posted it, but in Deuteronomy 18: 21-22, it says that the word that comes from the Lord will come to pass. if a prophet speaks a word that does not come to pass, then that word did not come from the Lord. because His word will never come back void.
on the flip-side, there are false prophets that speak words that come to pass as well. some of them actually have the gift of prophecy, but they are not using it to glorify God. the Bible says that the gifts and callings of God are irrevocable, and we are born bearing our gifts. so when God has ordained for someone to be His prophet, they are born bearing the gift of prophecy, and God does not take back His gifts... even if they misuse them, which is the sad part. so some false prophets do have the gift of prophecy, they're just not using it to glorify God, and some of their words may actually come to pass. Nastradomas predicted things that came to pass, but he was not a prophet of God. false prophets pick up the information they have "illegally" so to speak. they pick them up in the spirit realm through demonic spirits (remember Satan is a spiritual being and so are demons), but they do so illegally via familiar spirits. i believe someone already addressed this, but a lot of false prophets operate through familiar spirits and spirits of witchcraft and divination. i must say this, FALSE PROPHETS IN NO WAY KNOW WHAT GOD KNOWS ABOUT YOU NOR DO THEY KNOW AS MUCH AS GOD KNOWS ABOUT YOU! the information that they give is information that God had already intended to reveal to the person, or they're trying to manipulate someone's destiny which is often the result. the Bible says to look to God for your future. He knows the thoughts and plans that He has for you, and they are not evil. when we go to these false prophets trying know about the future, the information that they give is only given for the purpose of manipulating your destiny... 2 get your mind psyched out so that they lead u away from the true and living God.
now there are some instances where the fulfillment of a prophecy hinges upon a response from you... that means that there's something that has to be done by you in order for that word to come to pass in your life. for instance, if someone gives you a word from God that your ministry is about to take off within the next year, and then the devil comes to attack that word and discourages you and you fall away from the faith and backslide, is it reasonable for you to assume that the word is still going to come to pass for you? of course not! now does that mean that God lied to you? no. does it mean that the prophet was a false prophet? no. why would you expect God to keep His word, when you haven't kept yours? in those cases, it does not necessarilly mean that the prophet was false, it means that you did not fulfill your part in order for that word to come to pass. in such a case, you have no right to accuse that prophet of being a false prophet. i need to also say, that whenever God speaks a word through a prophet or anybody for that matter, the devil will come to attack that word to get you to fall away from God just so that word over your life will not come to pass. in Matthew 13:21, Jesus said that tribulation or persecution comes because of the word. the enemy is after that seed. he loves to mock God, and if he attacks a word and you fall away, it gives him perfect opportunity to tell you that either the prophet lied or God lied (mocking God)... and neither would be the case in this situation.
i will give you another example. sometimes also, a prophet may speak a word of judgment or warning. they're not always telling about the nice car that God is gonna bless you with. sorry to be the one to break the news. prophets are the mouthpiece of God, so they speak what God is saying. and what God is saying may not always be pleasant to our ears. sometimes God speaks jugdment and warns us of certain things. so sometimes a prophet may speak warnings to you about a danger that may be up ahead of you. God is so gracious and merciful that He sometimes warns of Satan's traps that he has prepared for us in spite of our own actions. a trap is always hidden from the natural eye, because otherwise it wouldn't be a trap. satan is very cunning, you have to remember that. but God has given gifts to the Body and He makes us aware of Satan's devices. so that we don't fall into Satan's traps. so sometimes God may speak to a prophet and warn of something that lies up ahead. say you are driving in a car, and somebody tells you that there's a huge bump up ahead so you need to turn left in order to avoid it. now if you ignore the person, thinking that they know nothing, then guess what? you may go home with a flat tire. but if you listen and take heed to the advice and the warning that has been given, then you can make a detour and head in the right direction. sometimes prophets give words that put you back on the right path. they may warn you of something that lies up ahead. now the fulfillment of a word like that is contigent upon your response to the word, which is what i was saying earlier. if you take the detour then of course what they warned of will not happen. does that mean that they're a false prophet because that word didn't come to pass? no. it means that the Lord warned you, and you moved out of the way and avoided that situation. that happened to me a while ago. i wasn't following the Lord like i should've been, but the Lord sent a prophet to me and gave me a word and warned me of what could've happened to me had i stayed on that path. that is an excellent way that God proves His love, grace, and mercy to us even in spite of ourselves. you see how wonderful God is?
Jesus spoke prophetically to Peter when He told him that he would deny Him 3 times, so we see out Lord moving in this gift as well.
i mentioned also, that sometimes prophets speak judgment. a lot of people like to argue against these types of prophets saying that only Old Testament prophets spoke judgment, but that is so not true. most of the people that say things like that are in danger of judgment themselves. that's why they don't want to have to adhere to the words of the prophet. God gives us chances on top of chances to turn from sin and come back to Him. and sometimes if we do that, we can avoid His judgment upon our sin. isn't that what happens with salvation? unfortunately, just like with salvation, there are some who reject His words, and they wind up coming under the judgment of God. but God will always warn you beforehand, and sometimes He does that through a prophet.
now as far as this lady going to heaven or hell... if you wanna know whether or not she really went to either of those places, i don't know and probably no one knows for sure but God. but is it possible? yes it most certainly is.... let's find it in scripture:
2 Corinthians 12:1-2 (KJV)
It is doubtless not profitable for me to boast. I will come to visions and revelations of the Lord: I know a man in Christ who fourteen years ago -- whether in the body I do not know, or whether out of the body I do not know, God knows -- such a one was caught up to the third heaven.
(my emphasis)
now here Paul is speaking about his vision of paradise or heaven. when he says "I know a man", he is speaking of himself. then he goes on to say that he was caught up into the 3rd heaven, which is where God dwells. we commonly refer to it simply as heaven. so there is a scriptural account of someone who was taken up into heaven. but the difference here is that they didn't write a book about it and then sell it in an effort to make millions of dollars...
i don't believe that that is the goal of everyone who writes books about revelations and things that the Lord has shown them and so on... because only God really knows if their experiences were authentic or not, so you have to walk in discernment and ask the Holy Spirit to lead and guide you into all truth, because Satan is itching to guide you into deceptions and false doctrine... personally, whenever i read a book by any author, i ALWAYS pray and ask the Holy Spirit to lead and guide me into TRUTH, not error. that is His job - to be our Guide and Helper for these types of situations. so let Him lead you into truth. if a word comes from Him, He will let you know. remember the Holy Spirit is the One in the Godhead who gives administers spiritual gifts to us, so He will let you know when a person is operating in a gift given by Him or by the devil. that's why it's so important that we build our relationship not just with God the Father, not just with Jesus our Savior, but with the Holy Spirit as well, so He can be our Guide into all truth and keep us from error.
let me tell you, i'm still learning about this topic myself. and it is a very extensive topic. this is just some of the things that i have learned so far, but i will update if i find out anything else that may be of help. i hope this information has helped you a little bit more. God bless you!
PS a good book that deals with this is "The Prophet's Dictionary" by Paula A. Price. i learned a lot about this subject through that book, and it has a ton of other useful information as well. i bought mine through amazon.com, so maybe it'll help you out too. God bless!