Hi Fullcrum!
Relationships (of any sort) with pwBPD can be bewildering. Their feelings and emotions can change in a heartbeat and, for them, feelings = facts. They will distort reality to fit whatever they're feeling in the moment. For a Non, that's difficult to follow.
There's no way of knowing, really, what she intends to do in the future. Could she come back and want a sexual relationship? Maybe. But one thing you should keep in mind: her behavior patterns are unlikely to change.
In the meantime, I'd respect her wishes. Don't block her, but don't reach out either. The fact that she's still following you and hasn't cut you off may be a positive sign.
I'd also urge you to read up on BPD and relationships. We have some great resources here:
https://bpdfamily.com/content/what-does-it-take-be-relationshiphttps://bpdfamily.com/content/how-borderline-relationship-evolveshttps://bpdfamily.com/content/my-definition-love-i-have-borderline-personality-disorderAlso, keep reading around the boards.
If she does come back and does want a relationship (and you decide that you do, too, fully informed about BPD), you and she will both be better off if you go into it with an arsenal of knowledge. The more you know, the better chance you have.
I've thrown a lot at you but I hope you'll take a look when you feel like it and let us know what you think. Keep posting!