Deb, this must hurt so much! Even if you had figured things out earlier, IMO, it would hurt, but I'm sure you're right, you wouldn't have had to experience this heartbreaking shock. So awful!
I'm still wondering if ED (estranged daughter) and ESIL have indicated anything that bothers them. I ask b/c a friend of mine had a similar experience. She provided childcare for years, while her D and SIL worked, and they had a disagreement, now and then, but nothing serious. Then when the childcare was no longer needed, she found herself CO. Her D told her she was "too controlling." Friend pointed out that she (D) didn't seem to think so all the years she (friend) was childminding. But, apparently, D said friend's behavior had been bothering her a long time, but she couldn't CO her before b/c she needed the help. Now that she didn't need the childcare anymore, according to friend, D said she was now "free" to go NC. D also complained that she told friend about this problem many times, but friend "didn't listen." Friend told me, she's not sure, she doesn't remember D saying anything about this, but thinks maybe it was during some of their arguments and she (friend) just didn't pick it up.
I'm NOT saying that you're controlling or anything like that, Deb. You sound like a wonderful GM to me. I'm just asking if there is anything you or DH have been doing that ED and ESIL object to and that you could change? B/c maybe that would solve the problem or, at least, lead to some healing. If not, then... sigh... so deeply sorry...