I have something similar, a personality disorder. It's not one that means I want intense relationships with people (although obviously not everyone with BPD or EUPD have that, everyone is different).
I know people have become angry on this thread and said that they hope no one reads this well.....I'm going to disagree with that. Ive read it and I feel really sad. Sad because due to how I am I've treated some people absolutely appallingly.
I'm treated now and under a specialist mental health team probably for the rest of my life, but I'm so ashamed of what I've done in the past. I made an ex's life pure hell, and my DHs as well before everything came to a crisis point and I was diagnosed and treated. I'm lucky I have him and that he didn't walk away. I wouldn't have blamed him if he had. He still has very difficult times with me but things are better now. I also have a friend who ended up in the firing line of what was going on and I almost broke them too.
I've since spoken and deeply apologised to my ex although neither of us would ever want even a friendship but we are cordial on the rare times we have had to see each other or talk.
It's bloody difficult OP and your DD has done the right thing. Do what you need to do, involve the police if she is in any way unsafe.
Yes there is a stigma and it would be better if there was a more widespread understanding of how this sort of thing happens, as it is due to childhood trauma.... But that wouldn't excuse violence and trauma given to other people as a result. To me, when I've hurt people it makes me feel worse - the person who abused me, is then making me hurt others and so in my mind it feels like they are still spreading their abuse and poison from the grave.
I've done some absolutely horrible things to people and no, it wasn't my "fault" as it's not my fault there's something wrong with me and I act the way I do. But it's also not ok, and OP has every right to do whatever she and her daughter needs to do to keep safe.
I don't mind reading what anyone has written, and being called "fuckers" well... That wasn't needed.