Hello Reco665 and welcome.
I’m so sorry to hear of what brings you here, it can sometimes be really difficult knowing what to do when you have a child with BPD, you will quickly find that you are not alone, there are lots of parents here who share their own stories and offer support.
I'm very glad to have found this site. I feel like I have tried everything within my power to make my relationship with my daughter loving and peaceful. Just when I think I've succeeded the attack comes out of the blue. I'm at the point where I just want to cut off my relationship with my daughter, it hurts me so much.
We all feel like this at some point in our relationships, it can be extremely frustrating and painful just trying to have some sort of relationship with someone who we love dearly. To the right

you will see
THE LESSONS, perhaps you might find Lesson 2 helpful - If your current approach is not working - change it.
You ask “how do I handle her attacks?”, you could try removing yourself or telling her that you are only prepared to talk to her once she is calm, she may not like it but it is something that you could try in order to protect yourself x