Ellen White's eschatology was most definitely pre-millennial. She believed in a millennium composed of a literal 1000 years, immediately preceded by a literal second coming of Christ.
After the saints are changed to immortality and caught up together with Jesus, . . . Jesus and the saints sit in judgment. The books are opened—the book of life and the book of death. The book of life contains the good deeds of the saints; and the book of death contains the evil deeds of the wicked. These books are compared with the statute book, the Bible, and according to that men are judged. The saints, in unison with Jesus, pass their judgment upon the wicked dead. "Behold ye," said the angel, "the saints, in unison with Jesus, sit in judgment, and mete out to the wicked according to the deeds done in the body, and that which they must receive at the execution of the judgment is set off against their names." This, I saw, was the work of the saints with Jesus through the one thousand years in the Holy City before it descends to the earth.—Early Writings, pp. 52, 53.
This judgment, committed into the hands of the redeemed (Rev. 20:4-6; 1 Cor. 6:3), does not decide who is saved and who is lost. That verdict has obviously already been rendered. Rather, this is the "sentencing hearing" to determine who will receive many stripes and who will receive few (Luke 12:47, 48).
Then at the close of the one thousand years, Jesus, with the angels and all the saints, leaves the Holy City, and while He is descending to the earth with them, the wicked dead are raised, and then the very men that "pierced Him," being raised, will see Him afar off in all His glory, the angels and saints with Him, and will wail because of Him. . . . It is at the close of the one thousand years that Jesus stands upon the Mount of Olives, and the mount parts asunder and becomes a mighty plain. Those who flee at that time are the wicked, who have just been raised. Then the Holy City comes down and settles on the plain. Satan then imbues the wicked with his spirit. He flatters them that the army in the city is small, and that his army is large, and that they can overcome the saints and take the city. . . .
Then the wicked saw what they had lost; and fire was breathed from God upon them and consumed them. This was the execution of the judgment. The wicked then received according as the saints, in unison with Jesus, had meted out to them during the one thousand years. The same fire from God that consumed the wicked purified the whole earth.—Early Writings, pp. 53, 54.
Thus, the redeemed return to earth after the millennium and the unsaved are destroyed, Then the earth is recreated, and Jesus reigns forever in the New Jerusalem upon earth, the new capital of God's universe.