Hi dnof and a warm welcome to the group. So many parents here will understand your deep desire to help your beloved daughter heal -- you so want her to be well, and that comes across in your post.
It can be challenging when your child with BPD is an adult child. In your area, is age 20 considered adult? Even if so, do you still have any kind of guardianship over her?
One of the weird upsides to BPD is that it can be thought of as a "relational disorder", where the closer the relationship, the more traits and behaviors come out. But -- it takes at least 2 people to be in a relationship (more if it's a family system), so what that means is critical for you.
What it means is that even if your D20 doesn't do anything to help herself, you still have the power to impact the dynamic between the two of you, if you make changes in how you relate to her.
It won't cure her, but it can make things "less bad" to learn some new, often unintuitive tools and skills for communicating with pwBPD.
Check out our section of articles on
when a child has BPD for starters and let us know your thoughts.
Another free resource for families is the
NEA-BPD, which offers a no cost 12 week course called Family Connections, for parents in your position, who want to make things better for their child and family. Take a look and see if you think it'd be a good fit.
I think you mentioned another daughter? How is she doing with all this?