I dont think predicting an earthquake is a prophecy like we see in the bible, if she actually did such a thing in the first place. Hard to say at this point.

Ellen white was just a bible commentator. I'm not even sure she wrote those books. But they did depart from previous teachings such as that the Revelation chapter 10 is about the Protestant Reformation. Thru one of her quack visions i.e. Jesuit inspired deceptions decided to change this established Bible truth to chapter 10 being about SDA and 1844. That just does not fit between chapters 9 & 11.