I got to sit down with my daughter and really talk about this move she's making. There was more to it than I realized (which I kinda knew) and I feel better about it. Her baby is due in January and she's been feeling the pressure of going back to work sooner than she'd like. She wants to be able to be home with him for more than just the 6 weeks of maternity leave. When her husband got laid off, it was like a window of opportunity had opened. They can stay with his folks for a while, maybe a year. By that time, she should be back working and they can get their own place. She's already got leads on some jobs and her husband's family has a large network to work with, or so I'm told.
I told her that, while I'm not "happy" about this, I'm also not "angry" about it. I don't want her to move but I get it. If she had left home for college at 18, I wouldn't feel like she was making a huge mistake and fucking up our lives. We're going to miss seeing her and our grandson regularly but flights to Denver are short and not expensive. So we plan to visit regularly. I think this was the best outcome I could've hoped for. all things considered.