I really understand that you are missing them, possibly a little resentful that you feel you've given them so much in terms of support, and that your daughter has taken a while to contact you. That's fair enough to feel that way.
As the daughter that moved away (although I'm good at keeping in touch) can I just say that especially when you first move, time seems to slip away very fast, as you paddle furiously, trying to keep your and everybody elses head above water as you adjust, get sorted, and find your feet. There's just so much to sort out - every aspect of your previous life has to be replicated, kids have to be supported as they adjust, you've got to find everything that you need or want - what brands and where to get them, set up your household again!
Oh, and on top of that, there's usually a huge whack of guilt at having uprooted your own little family, and left your family behind. . .
I'm sorry you're feeling low, and having trouble adjusting. It's understandable. I guess, I just hope that no one says something in what is a very tough time for everyone, that might burn bridges, or cause wounds that may take a long time to heal.