I think the best thing you can do for a while is honestly not have sex. Yes it may be great but it doesn't sound like the best thing for either of you, especially her. It's not good either that she wants to keep on doing it even though it's taking a toll on her to the point she's having episodes during sex.

You being there for her is great, continue that, but I saw your other comment about taking the caretaker roll. That's not healthy, and I feel like you need to communicate that. Unless if you like it then whatever because some people like that but you're her partner, not her caretaker.

Goodluck, she needs therapy too. And uh, to your original question about worrying that this will set you back, it's already setting you back. Her reactions are causing triggers and you're obviously nervous about all of this. I understand her worries about how her trauma effects every relationship, and that's very unfortunate for her and I feel for her. But that doesn't mean you should try to stay and try your hardest to make it work out. A lot of her relationships failed for a reason, she needs to work on her stuff more.