Hi Seed

and welcome

I'm so sorry you are struggling, you've been dealing with her mental health since a child and it's a recent BPD diagnosis. It's hard not to take it personally, I'd feel hurt and angry too! Is your DD engaging with the treatment? I recall a father here who described how the professionals at the residential centre said his DD18 had to 'jump the fence' to help herself. She did in time jump the fence but that run up to the fence was excruciating for the family. What led to the BPD diagnosis Seed, did something happen?
Glad you've joined us for support.
WDx