Hi Mamaerebell1,
First, I would like to say welcome to the forum - you have come to the right place to find support, empathy and understanding. I am so sorry for all that you are going through with your daughter. I, too, have a BPD daughter, aged 21 and the behaviours you describe are very familiar as they will be to most other parents here.
A good place to start is reading through the resources found on the right hand side of this page
When I joined this forum last April, I felt lost and hopeless dealing with my daughter. The support that I received here has been invaluable to me. Just the validation and realization that there are others out there that are going through similar experiences and they understand and are non-judgemental helped me start to let go of my own guilt, begin to accept the diagnosis, and learn from other parents here and the myriad of resources on this site. My daughter and I are in a much better place right now then we were 6 months ago... .maybe even a good place.
Please keep posting, Mamerebell1, as well as reading the experiences of others. You are not alone. There are many others out there walking a similar path and this is where we come together to commiserate and support each other. MomMae