We aren't required to keep the Sabbath. The New Testament clearly spells this out.
Romans 14:5
One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind.
Colossians 2:16-17
Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: Which are a shadow of things to come; but the body is of Christ.
Also, Ellen G. White was a false prophetess. God does not call women to preach to men.
Have you read Peter about Paul?
As also
in all [his] epistles, speaking in them of these things; in which are
some things hard to be understood, which
they that are unlearned and unstable wrest, as [they do] also the other scriptures, unto their own destruction. 2 Peter 3:16
Is it then important to look more carefully at what Paul wrote?
God has called many women to be messengers and prophetesses.
Miriam, Aaron and Moses' sister [Exodus 15:20].
Huldah [2 Chronicles 34:22]
Deborah [Judges 4:4]
Isaiah's wife [Isaiah 8:3]
Anna [Luke 2:36] [she was even "in the temple"]
Phillips 4 daughters [Acts 21:9]
...etc.
There is a difference, however between that function and "ordained pastorship", the office.
A woman may indeed preach and teach [see Aquila and his wife, Priscilla, which it is written, "...
Aquila and
Priscilla had heard,
they took him unto [them], and
expounded unto him
the way of God more perfectly." [Acts 18:26]] the word of God, but again notice the distinction already made, between this and sacred office of Apostle, or "Pastor".
Many simply do not understand what Paul was saying in his epistles about "I do not suffer a woman to usurp authority... teach...etc." as He was dealing with an "authority" issue and paganism, even of the language of shorn heads [which pagan priestesses would do, like the priestesses of cybelle, etc].
As for the 2 "commonly" cited passages [Colossians 2:16-17; Romans 14:5], have you considered the context of those verses, and what is said in them, as well as looking at the language itself? if you have not, I would like to invite you to do so with me, and also consider what Paul wrote elsewhere, for the scripture cannot be broken, and Paul does not argue with himself about these things. Do you know what Paul is dealing with in Romans 14? in order to fully understand it, we must begin at Romans 1. What of Colossians 2, have you considered the previous verses and that the language in Colossians 2 speaks of multiple sabbaths, listed after the meat and drink offerings [daily], the new moons [monthly], feasts [seasonal] and sabbaths [yearly, and 7th year and 50th years]. Paul knows the difference between the eternal Holy, Just and Good and even Spiritual Law of the Ten Commandments, which includes the 4th [the 7th Day Sabbath of the Lord, singular, even called "my Holy Day" in Isaiah], from the very shadows and types given after it...
I offer you the chance to actually read the texts with me and study. Let us see if those two texts reveal an abolition of one of the Ten Commandments [4th].
The 7th Day Adventist movement is identified in Prophecy by specific markers.
As for Ellen G. White, I will ask plainly have you fully read the Great Controversy, or Desire of Ages? Have you fully read any of the material put forth, and if not why not? Thank you.
Luther also clearly wrote that the Roman Catholic Papacy was the AntiChrist... do you agree with that, or his stance upon the state of the dead and soul sleep? Did you know that Luther did not reject the Ten Commandments either?