Hi qz and welcome to the group
What a burden you have, with the fear that your daughter may take her life, coupled with the exhaustion of hearing the rants and threats over and over. That's not easy to tolerate.
Suicidality is so difficult to have in the family -- you feel like somehow it's
your responsibility to "not do the wrong thing" and to keep the person alive. It's too much, and it takes a toll on you. That's even with the knowledge that you cannot control whether she commits suicide or not -- we want to believe there is, but it's in her hands, not yours.
One unintuitive skill we learn when BPD is involved is that actually, we need to take care of ourselves first. Nobody is helped when we're depleted and wiped out. Endless giving to others doesn't actually help them or us. When we take care of ourselves first, we are then in a more grounded and centered place, with resources, so that we can mindfully decide on an effective path forward.
The fear must be a big hurdle to self-care. I wonder if there are smaller steps you can take, that might feel more do-able, in that direction?
...
Have you ever called a suicide hotline yourself, to describe the situation you're in, and ask them what they would recommend? They have lots of experience and may be able to share options with you that you haven't thought of yet.
The 988 hotline can be reached via call, text, and chat. What do you think about giving that a try, and letting us know how it goes?
We'll be here for you;
kells76