Yes, Ellen White does say that the wicked will be destroyed by the brightness of Christ's coming. She writes:
"At the coming of Christ the wicked are blotted from the face of the whole earth—consumed with the spirit of His mouth and destroyed by the brightness of His glory. Christ takes His people to the City of God, and the earth is emptied of its inhabitants."
—The Great Controversy, p. 657.1; see also
4SP 474.1 and GC88 657.1
This statement is confirmed by the annotation text in her books, showing that she explicitly teaches the destruction of the wicked by the brightness of Christ's coming.
References:
- White, E. G. (1911). The Great Controversy, p. 657.1.
- White, E. G. (1884). The Spirit of Prophecy, vol. 4, p. 474.1.
- White, E. G. (1888). The Great Controversy (1888 ed.), p. 657.1.