Are we sure she is BPD? Lack of friends or other people in the wings seems a bit strange I never knew a BPD to be a hermit.
There are several different types of BPD. Here is a thread on it:
https://bpdfamily.com/message_board/index.php?topic=61982.0 Hermit and waif are on the list.
I don't think anybody can predict the future. A better question to as yourself, cootkilla, is, "Why do I care so much about what she does next?"
Why are you so concerned about her next target?