I don't know that I can offer anything super helpful because I just don't feel that I can understand well enough to know what to think or write about this.
I do know that it could actually be your love, the actual love, that is triggering to her. You know?
Is it just me, or have others seen on this forum that it's fine for people with PTSD to be in casual and sort of romantic relationships as a sort of psudo-intimacy and diversion from PTSD. Relationships that help sufferers to distract themselves from real feelings can be a way to cope.
Then, suddenly, real love happens. When this happened to me, I felt lost and afraid. Confronted with love, something I always needed but always received with abuse attached to it...Well, I had to push it away!
The fact is, I think sufferers need love like good medicine that is hard to tolerate for years. I pushed and pushed my H. away. It causes me pain to admit that I hurt him deliberately. I thought we'd both be better off apart. I felt I was no good for him. I didn't realize I was toying with men's feelings, because really, I was walking on eggshells around my own my whole life. I didn't like this about me, but didn't know how to tolerate love or any emotion.
Maybe the trick is to keep things in the middle, not too hot or cold, and to hold on.
It took me ten years of marriage to get past the hang ups, mostly. I still have them. I am much better now and don't take everything so personally and don't make life so hard on my wonderful man. I am so glad that when I pushed him away, even though it hurt him (and me) he didn't give up on me, not for one minute. He stayed and took it. He passed every test. Love won.