people with bpd traits, generally speaking, can be really insensitive and selfish after a breakup.
having said that, anyone who has initiated a breakup is going to tend to be emotionally further along than the person they broke up with, more concerned with their own feelings, and generally oblivious to ours. so, youre dealing with that, at the very least.
the insensitive and selfish part is that shes expecting you to put aside your feelings, even after youve made them known, to ease hers. you are under no obligation to do that, of course.
thats the thing about breakups. one ex cant help the other ex heal, and it isnt at all fair of her to expect you to do that, any more than it would be for you to expect her to do that.
whether or not you choose to remain friends with her, or eventually become friends with her down the road, her pain is hers to manage; you have your own pain to manage.