This is something I feel quite uncomfortable speculating about: although it's obviously annoying for Grace to use PTSD as a get-out-of-jail-free card in the context of being called out for her privilege, what trauma she may or may not have experienced has never been confirmed by her.Someone on here earlier said he was the person abusing her, or hinted at it. Did ya get that impression? All sounds really strange and toxic either way!
If she said her ex was abusive, I would believe her- as a potential victim, she is the only person who could (or frankly, has the right to) publicly confirm this.