When Finley became a returnee and went to a parallel world with a different timeline, his body in the parallel world already existed.
However, now, Ainsley wanted to enter a parallel world with a timeline when her body, Ainsley's body, had not even existed.
This is something close to impossible, and it was dangerous because it means Ainsley would enter a new world with her fragile body and would change the future of that world.
Whatever happened in the future of that world would have a subtle connection to this world, but overall, everything would change drastically.
The Godfather in that world might never meet Ainsley in that world because he didn't become a spirit. Ainsley in that world would not be this Ainsley because she should be the original person, not a transmigrator.
