Hello Worried Mom23,
That's one of the most frustrating things about the disorder, how they seem to control it when around others, but as soon as the door closes, those closest to them become targets of their emotional dysregulation. I could always tell when my Ex had something going on (the volcano about to burst), but it was indeed often an eruption minutes after we walked in the door away from people.
Our son, 5, shows some of the neurological sensitivities as his mom, so I occasionally pop in here to read the board and hope that he doesn't start to lean towards acting more like her as he grows older. I'm sorry that your daughter acts like this towards you and others close to her. It's good that you are reading. Have you been trying the communication tools and lessons to the right of this board? If so, do you think that is helping?
I understand you wanting to withdraw from her, and perhaps that may be a boundary you need to enforce for your own protection, even if it's very hard with your grand-babies.
I have a few good cries this week with the realization that this is the life she will lead most likely and it prob wont get much better so I need to find ways to coup.
This is one of the toughest things: Radical Acceptance. Without a Dx and treatment, it's likely that she won't change, so the only thing we can do is support from whatever distance we can, and also change the way we behave towards the pwBPD in our lives (for me this also includes my mother).