I’m so sorry to hear your daughter has been so horrible to you. It’s very hurtful isn’t it? I do know as my daughter, who has some mental health issues, can very frequently be extremely hurtful in the things she says to us. Like you, we do a massive amount of childcare, and very often I feel very unappreciated. I’m sure that’s just how you’re feeling now Nana. Sometimes I think I put too much emphasis on the mental health issues she has suffered from, and I feel I’ve raised a selfish and entitled person, and I imagine that’s how you feel now.
In your situation, I would keep a wide berth for a while (one of my strategies) and let the dust settle. Then perhaps approach your daughter with the offer of a coffee and chat. Hopefully she’ll accept and you can talk it over rationally. However you must follow through your plans with your new husband, if you have both decided to move, do it. Your daughter will have to arrange her own life without you as an ever ready support. You can be sure of one thing, if she had decided to move, what you thought about it wouldn’t come into it. Do what’s right for you.