I feel sad for your heartache, V.. One thing I've learned, living next door to my mom with the intention of being here to assist her as she ages, is that you can't make yourself love someone when you just don't. As obligated as I feel to be a good daughter, I doubt that I will ever be a loving daughter, able to demonstrate affection the way my mom craves it. I might find out over the next decade or so, before my mom dies that I love her. If I do, it will come as a surprise.
If you can make peace with the fact that you did the best you could with your own knowledge and impulses, for better or worse, and learn to respect yourself, your daughter may come to respect you, too. If your attitude toward her is one of need, if there's anything pathetic in your pleas for connection with her, she may never be able to respond.
Considering your money history with her, I can fully understand her caution in letting you near her again. I would keep all future contact with her as upbeat and positive as possible. Report whatever good is going on in your life. If there's not much of that now, make it happen. Join a club, read good books, volunteer in some way that's meaningful to you, take a class – whatever you can that will create some upward trajectory for you.
And ask her specific questions about your grandchildren – things you'd like to know. What are their interests, life goals, worries, favorite books or games? Remember their birthdays, not with some expensive gift, but a heartfelt card.
And find a way to do these things because you care. Do not make the mistake of ever holding the wish that IF you do enough of X,Y, or Z, THEN your daughter will realize you love her, or want to love you back. Your expressions of love, ideally, should be only for your own peace and satisfaction. There can be tremendous healing in that for you, no matter what else may or may not happen.