I am a person with PTSD, and have been with my partner for 8 years. Granted, I've been doing this for awhile (15 years now of therapy), but I don't consider calling names and yelling appropriate behaviour, PTSD or not. (Though, I'm actually on the receiving end of that occasionally when my SO gets triggered, even though he is not the one with PTSD. But he does also take responsibility for that behaviour when it occurs.) If she can't control that, she needs more help than she is getting. I also don't expect my partner to be more than a partner--you have emotional needs as well, and you're human. An important distinction here is that she not only recognizes her issues, but realizes her healing is her responsibility. Yours is supporting her. But you can't be responsible for everything (like being "required" to be there 4 nights a week, just my opinion, but I feel that should be something done because two people want to be together, not out of a sense of obligation).
Having said that, yes, you bailing would probably exacerbate her existing issues, so it is not a decision to be made lightly.
I'm saying that as a person who was the one left--it just about destroyed me. What caused him to leave? 1 session of couples therapy, which I did not think was a good idea, I also felt it would only make things worse. He assured me that it would help us, that it would make things better. I tried to tell myself that it would end up being better than I feared, despite my anxiety. It was worse, and incredibly traumatic for both of us. It brought out a lot of pent up emotion in me (not anger, hurt).
We eventually got back together (we had been together for 7 years by then) and he discovered I was the only one he wanted to be with, that he loved me for who I was, and that he had been unfair in his judgements of me and not appreciating enough what I did bring to the relationship. My PTSD has made me a very compassionate and empathetic person. I loved him through good times and bad, and helped to raise his children in spite of chronic pain and my emotional issues. His family was very critical of me, and he came to realize that those things were not true. Are there characteristics in her that you value, that she has gained as a result of her trauma background? Are you judgemental of her not "sorting through her issues" because you were able to? Are you spending more time focusing on what's "wrong" with her, than her good qualities? Do you feel she is working hard on her recovery, and motivated to heal? (These are just questions to ask yourself, I'm not criticizing or assuming anything). Can you love her even if these issues get better over time (and she is treating you appropriately) but the PTSD never goes away? I had an abusive relationship with an ex that was 15 years ago and still strongly affects me. Some traumas are easier to overcome than others. How much is what you have going on on your plate--which sounds very full--affecting things? I guess what I am trying to say here is that even in a relationship with a person with PTSD, you are still bringing your own "issues" to the table. You may be tired, or stressed, or feel like it's all too much. But is that all her, or the rest of your life, too? It's a matter of balance. You could decide she is the straw that broke the camel's back. Or you could try and figure out what you need, and try to balance it with what she needs. It's not simple... But then, even relationships without PTSD are hard work.
I hope nothing I wrote is offensive to you... I'm just trying to give you an idea what it's like to be the other person--it was a horrible feeling to have given someone everything I was, everything I had, and to be told that all that meant nothing, that all that & my work on myself weren't good enough... And all because we went to couples counselling. I'm not saying that will happen to you, it might not, but sometimes there is a good reason for feeling it will do more harm than good. There was no talk, or plans, to end our relationship before that appointment. I would never, ever go to couples counselling again. He knows that, and completely understands my feeling on the matter. It *will* bring up a lot of emotion most likely. That is not always a good thing--it's better to deal with that sort of thing in 1 on 1 therapy than to have it spilling out in a torrent if things are already in any way strained. It really, really hurt my partner, and it definitely hurt me.
Having said that, I don't think realistically you can be yelled at or called names indefinitely either, if this is occurring on a regular basis, and I think she needs to understand that, if she doesn't already. Maybe you can both try to come up with a plan of some sort between you for coping with her triggers. Ideally, you have one for the two of you as a couple, but she also has to learn to cope with them for her own sake, whether you are there or not.
Anyway, if I said anything here offensive, I apologize, I'm not exactly at my best right now. Hopefully it will give you some things to think about and consider. If she loves you, she will do what it takes to make things work, and vice versa. I think the only time a relationship is doomed is when either person just doesn't care enough, or have the desire to grow & change, and that applies whether you have PTSD or not.