I don't even mind the twist being predictable since the reveal was cool at least, but it feels like the writer realized how obvious it was and spent the last 70+ chapters making her look as incompetent, useless, and cutesy as possible. It's at a point where they can't even really explain why or HOW she hid her personality properly for so long. Every explanation will be forced and like a borderline asspull. A good twist should have some hints or setup, when most of the evidence is offscreen where the reader couldn't piece together clues it's just lazy and I feel like that's how it'll be for her.