Hi lisamc,
I wanted to join lbjnltx in welcoming you to the Parenting board. How old is your daughter? Does she still live with you when she isn't in treatment?
Validation is probably the single-most important skill I had to learn, and the book that helped me most was
I Don't Have To Make Everything All Better.
It took me a while to learn how to communicate with my son -- validation was a huge step forward. It is words, and more than words. It can be how we look at them, our body language, the tone in our voice. Kids with BPD treats have an almost desperate need for validation, and a very poor ability to validate others. I found it was essential in my own healing to have a therapist who could validate and support me so I did not expect my son to provide what he was not capable of giving.
Do you have support, maybe a spouse or family members, or perhaps a counselor who can help you make sense of BPD and your own feelings as you learn to adjust to this new diagnosis your daughter has been given?
LnL