nah she didnt return to the lifestream
the Cetra said back then that the planet will never be able to heal as long as she is there, even if it's only on a cellular niveu. that's why geostigma appeared. everyone thought that at the end of the game, after defeating Safer Sephiroth she was gone too, but her presence in the lifestream caused geostigma. but after the final fight in AC she won't (i think at least) return. that's why finally the earth (aerith?) was able to heal itself and the it's dwellers from geostigma. if she did return to the lifestream that wouldn't be possible.
and yes like i said we will never know, i'm aware, unless SE makes another sequel which solves it, but i opened this threat to see your OPINION not facts, its just hipothetical speak
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