Hi, I'm not sure I can offer any links or where to go for help, but I can offer support coming from a "Yes, I've been there" space.
Brief background, my mother also had BDP for her entire life, getting decidedly worse as the years progressed. I tried and tried again to fix her, to make her understand, to try and get her to accept she needed help, but it was like kicking walls. It was almost like she wanted to be a victim and didn't want to recover because it somehow kept her the centre of everyone's world. I always felt a very selfish attitude and I still stand by that because she never considered anyone else and how it may affect them.
I think what I've learnt so far from putting posts up on here and hearing from different sides is that the person has to firstly, accept there is a problem, stop staying in denial and accept the help. If they can't get past that bit, the journey continues on and on and it gets no better. That person just continues on their path, sacrificing so much along the way, and gets no better and in my case, a lot worse. I truly believe that your daughter needs to, and I mean this very sympathetically, to wake up, accept there's an issue, start thinking that the future could be bright with her in it, where she can achieve and push through these demons (with help) and be a better version of herself. If she see that vision, she can conquer anything, but that lies with her and not you. I have learnt that fixing someone doesn't work, they have to fix themselves.
I sincerely hope that your daughter will one day take life and run with it 🙂