Hi KCat
I have walked a mile or two in your shoes... .many hurtful periods of n/c with my daughter. I know only too well when you write that you have grieved (are grieving) the death of a dream. When we first hold those babes of ours in our arms, we have this dream of the wonderful future we are going to share with them. Then reality hits, harder to some than to others.
I've read that there are 5 stages to grieving... .Denial - Anger - Bargaining - Depression - Acceptance. I don't know about you, but I do remember bouncing in and out of all those stages as I dealt with my daughter and her BPD behaviours.
Actually, it was my last stage of Anger that finally pushed me into Acceptance... .and I started to make changes (mind you... .a work-in-progress!). Heaven knows my daughter was not about to change. Why would she? Her "reward" had always been watching the way I would react during one of her "episodes." I never disappointed her. That was then... .this is now.
So, KCat, there is nothing to say you have to go into any kind of a relationship ever again with your daughter. If you do, though, it shouldn't be the same as you had before. Check out all the info to the right

. Be well-armed. Mostly, work on having other things going on in your life, ... .volunteering, reading groups, whatever it is that turns your crank, things that bring some joy and feeling of fulfillment... .less of the focus on your daughter... .more of the focus on you... .and your world will be better.
Huat ; )