I remember your first post here on the forum.
Honey, nothing has changed.
You said your kids, remember, they are your kids, she is not getting what she wants, the pounding will just continue.
Block her texts, phone calls, emails, etc...
Let her go, she needs to focus on her own issues, if she is BPD, which by the way is pretty prevelent with those who suffer with addiction, the hatchet will just keep coming down on you.
You can not fix her, love her, but you and your kids, a good life awaits you all, I hate to say it but it seems that life will not include her.
The only life you can heal is your own.