cmjl:-
I'm another who thinks - believes - that PTSD is never an excuse for cruel, abusive, or even just plain unkind behaviour. It can be a reason, it can be an explanation. But never an excuse. I can't help feeling that when she says 'it is what it is' that she's somehow trying to excuse her behaviour.
To give some more context to what I'm writing, my hub has PTSD, and he's done some dreadful things to me. I also have PTSD, and have been truly horrible and nasty to him. Usually this is because one of us has been triggered, or for me because I'm having a sort of emotional flashback, and something he's done is bringing things back that I'd suppressed or forgotten about.
We get through it by sitting down and talking about it afterwards. By working through it together. Sometimes days later, once we're both able to face it.
Everybody's different, and everybody has different levels of tolerance, and different things amount to breaking point for them, but for both of us it's about treatment. If either one of us flatly refused to get help, then that would very likely be a deal-breaker. That said, we haven't forced each other - more an inordinate amount of nudging and cajoling.
Again, everybody's different, but I don't think hub would have been able to work through his issues on his own, and I don't think I could either - though I understand completely how scary it is (I have a horror of medical stuff in general) - and I'm in the UK, so don't have to worry about costs or anything like that.
Anyway, I just wanted to say that the fact that she doesn't apologise indicates to me that she may be in denial that what she's doing is actually hurting you as much as it clearly is. I had to go through that with hub (he was diagnosed before me), and the way I dealt with it was by talking to him when he was calm, and explaining to him that it had deeply hurt me.
At the end of the day, any relationship has to have two sides - PTSD is an irrelevance to that fact. If she didn't have PTSD, would you accept that behaviour from her?? Then why accept it because she does? You can make allowances while somebody is working through stuff, and while people are dealing with things, but you can't forever.