She was basically written to die.

Bring in a new character out of nowhere, with a superpowerful quirk, that's determined to bring down the main villain on her own? You just know there was no other way it was going to end.

I like what she did with her quirk at the very end, but I have no idea how it's going to serve the story. I can't tell what's needed right now, nor which way it's headed. Maybe to reduce AFO's quirks and make him a bit easier to write?