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What you're dealing with sounds like a high level of narcissism. I have known a few people who took it to this extreme as well and it seriously drained me to be around them. It's frustrating as all get out - I hear ya. I've learned that even though they try and create the illusion that others are beneath them... really I should feel sorry for these types because really and truly they are living in a false reality of their own making and aren't experiencing true life. They do this because they cannot bear the pain of realizing that they are not perfect as they believe they should be. So really you should feel bad for her above everything else, she is her own worst enemy and a prisoner in her own body (no matter how much she may try and convince you otherwise... these types are good actors). Because of the way she acts, she is not able to develop true, healthy, solid relationships with the people around her.

This is my opinion, due to my own experiences: you need to get away from that. She has a toxic personality that is not healthy to spend large amounts of time around. Sure, when you do encounter her at church or elsewhere, you can be nice to her and show her the right way to act simply by being you... but yes - pride does breed pride - if you hang around this girl for too long and she continues to bash you out of your healthy view of yourself... you're going to start adapting the same patterns she uses to cover up the pain you're feeling as well... you're going to also end up tempted to belittle others if your self confidence gets low enough. You can't give what you don't have. If you hang around her a LOT, she's going to damage the healthy and good parts of you... if she damages those parts of you, what will you have to give out to others in relationship?

Do NOT feel guilty for taking care of your health. In this case, she truly has become toxic to your emotional and psychological health. You are not being selfish by limiting time around this person. You are being unselfish, if you look at it from the perspective of "because I'm in better health when I'm not around this girl, I'm healthy and emotionally available for my loved ones to spend time with." Also, God has given us stewardship over our own lives; I believe part of being a good steward over your own life is to guard your heart, as God's word tells us (Proverbs 4:23). If you're guarding your heart and being aware of the company you keep (Proverbs 4:14-15; 2 Timothy 3:2-5), you will have a heart that is healthy and ready to receive God's teachings and to thrive in companionship with God.

Pray that God gives you guidance and how to limit time around this girl, and really beyond that, all you can do is pray for her from a distance. I hope things work out - I'm praying for you!