Hi and welcome to the forums. We've all been through the same thing so we know exactly where youre coming from.
I reached out on secondary account and told her "I am reading up on the BPD discard and am hear whenever you want to talk" to which she replied "I'm sick of people attributing my breakups to my mental condition" before another block on that account.
A lot of BPD's won't ever admit they have any sort of problem, always playing 'the victim' and can react badly to any accusations of being the cause. Even when breakups happen a lot they can't make the logical connection that they are the common denominator in every incident. BPD is an illness of self-denial and if the sufferer believes they aren't the problem then they'll do nothing to try it fix it. In their mind it's 'the world' that needs fixing, never them.
If you keep contacting them they can become overwhelmed and this can make them withdraw further. We're often in a no-win situation where if we ignore them they think we dont care and if we make too much fuss we're 'controlling and demanding'. BPD can turn our well-meaning acts into ones seen as hostile.
One thing applies to all versions of BPD; you can't make them do anything they don't want to. I'd be inclined to send her a simple and sincere message that you're there for her whenever she wants to talk and then you can do no more - the ball is firmly in her court.
I used to give my exBPD g/f space to cool off and she would eventually return to the place we used to go, but she could takes weeks - and in one case 9 months - to do it. Once I'd wrote though, I didn't keep contacting her.
Hope this helps, no doubt others will be along to give help and advice too.