Welcome
Grateful Gram! 
I'm also glad you found us. I remember when I came here in 2018 I also felt great relief that there is a community of people with similar experiences who I could reach out to for support. There is nothing quite like navigating a relationship with someone with a personality disorder and even well-meaning friends and family often don't know how to help.
I'm so sorry to hear you don't have a relationship with your grandchildren, heartbreaking is the perfect word.
It’s 4:13 AM and I cannot sleep.
You say your daughter told you that she wishes she never had her three children, and I'm guessing that is the reason for your sleeplessness, right? I bet it was so hard to hear that; we love our children and their children so very much.

Can you tell us a little more about that conversation?
Some more questions, so we can get to know you better...
Does your daughter know about BPD and does she agree that she ticks all the boxes?
How is your relationship with her?
Do you have support from family and friends? A therapist of your own? Many of us find working with a therapist who is familiar with BPD to be very helpful.
You may have noticed that the forum will allow you to "go on and on" (the max characters allowed is almost 2k!) so I encourage you to do so. If you look at my post history from when I came here, you'll see I took full advantage of all that space. Somehow, just typing it all out helped me so much. Getting feedback and replies was so such a saving grace.
I look forward to getting to know you,
Grateful Gram~ OH