This sounds like behavior not specific to bpd females, she wants to stay in your consciousness but make you think she doesn't care... she is still thinking about you.
Thanks expatblue,
I agree 100% that the behavior of showing up at the yoga studio is not specific to BPD. To tell the whole story of what has gone on would take pages. She has engaged in behavior much more significant than this over of the relationship that is very consistent with BPD and she is an abuse survivor who will not get help.
This incident actually pales in comparison to what else has gone on. However, showing up at the yoga class where I am likely to be and staying through the whole thing only to run out at the end just struck me as so odd I didn't know what to make of it? If she wanted space then the easiest thing for her would be to just go to a different studio.