Hello Calliope1973

Sounds like your having some real struggles with your mother, I'm sorry this is happening. BPD is a serious mental illness and can be painful and frustrating for all involved. You've come to the right place for support. Many of the members here have parents with BPD and all understand what you're going through.
A lot of the time people with BPD don't see there's an issue so it's difficult to get them into therapy. It has to be something they want to do for themselves.
How are you coping now? Have you considered going back to therapy for support with what you're up against?