[quote=@Joshua Tamashii]
Powers going out of control. Anti-form at worse, if acceptable.

After all, Sora recovers from Anti-form when he goes into it
[/quote]

She had brought him back from becoming a literal heartless when he released his heart which held her heart when she was in the coma for four years and another was when his jealousy fueled his darkness in Narnia. Remember she literally fought the dark form on the inside