These can be significant challenges and you can't fix this for her. She needs professional help and can't expect you to be her punching bag if she is being triggered and cycling.

We can love another person and yet really not be able to maintain a relationship with that person. You can't cure her or fix her she has to work on that herself and all you can do is be supportive. Yet, you do have your own challenges that you need to consider and maintain your own mental health.