Hi Bradley101,
there are many types of disordered people, some only temporarily and it is hard to tell from the outside. A proper BPD diagnosis requires a professional looking at the person in detail and part of what plays into that are lifelong patterns.
What makes you concerned about this individual? You wrote you "used" to work with her which is past tense. You also write that you are not interested in her. Still you signed up here, post on the Staying board and are concerned about her.
What's up?
,
a0