Hi heronbird
Though I'm not from Parenting, I do remember you!

I am sorry to hear this about your daughter and her current heroin addiction. You have already been through a lot with her and if I'm not mistaken your daughter received DBT for her own BPD. You had some doubts back then about the DBT and your daughter was frustrated too because the people treating her at times appeared to lack competence. Is your daughter currently still getting any kind of targeted treatment for her BPD?
That boyfriend she had, did he also use heroine himself? Or did he only make your daughter take heroin?
No one would understand would they. They would say, shes stupid and just a druggie waste of space.
People can say a lot of things, but no matter what they might or might not say, no words of them can define your daughter or determine her worth. Your daughter definitely isn't a waste of space. No matter what she does or how many mistakes she makes, she is still a precious human being.
I am glad you do believe she is trying to get better and I am also glad you are still there to support her.
The Board Parrot