I don't know what I can do for her, I can't force her to get help. I don't believe she is a danger to my daughter but I could see her being a danger to herself in one of her impulsive moments.
Hey Silveron, I am sorry to hear about what you are going through. I have been in your shoes, my friend, and understand how frustrating and frightening it is when one's BPD spouse is in a rage. Remember: you didn't cause your W to get BPD and likewise you can't cure it. No, you can't force her to get help. What you can do is focus on the things within your control, such as removing your gun. Perhaps you can talk to your D about her feelings? Or arrange for her to see a T? I suspect she is fearful if she sent a video of your W to your mother-in-law.
Like your W, my BPDxW threatened suicide many times, which I view as the ultimate manipulation. I went to the local hospital twice to meet w/staff in the behavioral health unit because I was so worried and didn't know what to do. The hardest part for me was that, even though I was 99% sure that my X was just crying wolf, I had anxiety about that 1%, thinking that maybe this time she was going to carry through w/her threats. The stress can be enormous, I understand.
Have more to say but think you have enough on your plate.
Keep us posted! LuckyJim