Board Thread:Episode Discussion/@comment-4141313-20181208003742/@comment-26397825-20181209084408

Apparently the invulnerability is her semblance. Source. There’s even a moment Maria hits her and she doesn’t even get knocked back a little bit. She just outright ignore the hit.

But obviously it’s an active thing - she has to specifically activate her semblance, otherwise she gets knocked around just like a normal person.