User blog comment:MakeShift/The Crisis and its impact on the Arrowverse Wiki/@comment-31524712-20200124154231/@comment-2054358-20200129231957

How do we know Laurel of Earth-2 wasn't reincarnated as a part of Earth-Prime? She is one of the people that J'onn woke her memories of. Is it possible she could have replaced Earth-1 Laurel in Earth-Prime's history? She never went back to Earth-2. If she did end up back in Earth-2, nobody would be able to find her because the changes in the frequencies of the Earths would make interdimensional travel harder and the extrapolators won't work. In The Bottle Episode, everyone believes that Earth-Prime is the only world left.