Hello, Madame X, and I'd also like to welcome you to this site. I'm really sorry for the troubles you are having to deal with regarding your daughter; all of us parents on the
Parenting a Son or Daughter Suffering from BPD Board know exactly what you are going through! Like Mutt, I encourage you to read the posts/threads by the other parents, and I'd also like to encourage you to read the
TOOLS and
THE LESSONS, and all of the other links to the right-hand side of the Parenting Board.
I have an adult (38) son who was diagnosed with BPD in April of 2013, and reading the information I mentioned above really helped me understand how his mind works, and what I can do and how I can communicate with him to make things better. And once I made things better with him, things got better for
me, and then our whole family

Getting a handle on what I was really dealing with--and learning about the changes I had to make in
myself in relation to dealing with a loved one with BPD--things got much easier... .And I did, indeed, learn how to "not make things worse"
How old is your daughter? Does she live with you (or nearby)? Do you see her often? Is she married? Does she have children? Does she think she has a problem, and has she ever been in Therapy or diagnosed? One of the techniques that we learn to help with dealing with a loved one with BPD (or BPD traits) is
Validation, and here is a very good link to how it works:
Communication using validation. What it is; how to do it. Another good technique that would be helpful to you would be
TOOLS: S.E.T. - Support, Empathy and Truth. Validation and S.E.T. go hand in hand is calming down situations and helping to make things better with our BPD loved one.
Please read all you can on this site, and on the Parenting Board, and tell us more about your situation... .You can ask for help with specific troubles and circumstances, and we will do what we can to help you understand and mitigate the problems. We're here for you, Madame X, and look forward to hearing more