She's not going to come back is she?
It is more likely that she comes back than not, is my guess.
She's probably prone to withdrawing because it's the reliable way to bring her emotions back to baseline. Having intense emotions and a shaky sense of self means she won't have an easy time regulating her feelings.
For some reason I trigger her..
Close relationships produce more heartfelt emotions, both negative and positive. You have a close relationship with her so she will have more emotions to manage.
I would use this time to become a generous listener with her. She is likely to have extraordinary emotional sensitivity, perceiving your emotions sometimes better than you may be able to in yourself. I use generous listening as a way to get myself grounded for black belt level validation.
It's the first step to building trust in a relationship that may be going through a shaky period.
It doesn't mean you allow her to be abusive.
I think you have a lot of positives in your words and actions. So much of this comes down to how we say it and when we say it, followed by what we do next. For me, I tended to say the right thing
and the wrong thing. Some of us have to do a lot of editing

My tendency was to validate with one sentence and then judge/lecture/spar/debate/explain/defend/argue, etc. for the next three paragraphs. It works best for me if I validate and then wait until a time when trust is there.