Is she actually stuck or can she go back the other way?
She would keep falling, but remember.... time works a bit differently between both gaps. You can say you would suddenly see the other side suddenly turn back on, even though the window has a brief journey across time and space(or location).
more "dream bubbles = void" stuff here. Magyyk Rogue of Void powahz GO!
It is going to be hella weird if it turns out that some double reacharound weird plot s**t happened between the two universes post-scratch and post-green sun forging. But that seems to be what the presence of the trolls' lusi on Jake's island, and these possible ancestors (and BQ=Condesce...) stuff is pointing towards.
But...if we're seeing the Ancestors now...and this is the Condesce...
is grownup!Feferi the one who usurped the BQ's throne?