Bottom line, even she made it back to tell the story.
With a black hole there is NOONE to come back and tell a story. A wormhole is different than a black hole at least the theory of it.
IMHO and it may be wrong and I have no proof of it but my own opinion that I will explain later. The theory is the Universe is an expanding universe and that everything that expands much contract. Well what if these black holes take matter and at the other end extract it to prevent the universe from contracting back in on itself?