Maybe Jesse wells survived and harry didn't and here is a good reason why
The ectrapolator was damaged and the skies were red with the anti matter wave destroying earth 2 leading to harry (who was kicked out by jesse) as he was regaining his intelligence managed to fix it for him and jesse but out of nowhere the anti matter wave came and took out harry but quickly before his death threw the extrapolater to jesse and since it was just fixed it took her to a random earth (which did make it to to the new multiverse) and crisis came with her getting erased by the antimatter wave and was brought back to the new multiverse and since the new multiverse isn't discovered she is still in earth something and she spent the past few weeks to this present day trying to figure out how she can make the extrapolater to go to other earths with hope she can make it to earth prime and she would have been done but she began losing her speed so she had to do everything she could to make it to earth prime and maybe could be seen in future seasons