I dont think she has a fear of abandonment as much as she had a fear of being hurt through trust. Is this similar? What differences are there between trust issues (worrying about being hurt) outright and a fear of abandonment?

Is a fear of rejection the same as a fear of abandonment? What are the differences? Similarities?

I ask because I suspect she needs to talk to her doctor about Avoidant Personality Disorder rather then or comorbid with BPD. 

I just want her to get the help she needs.