Claire, you handled the MIL thing well. But frankly, if she is going to reach out to you by sending an email, then she is the one opening the door to hear how you are doing. And how you are doing is directly connected to your H, her son, and his choices. You did not badmouth him. I thought you were pretty generous, actually, and mainly focused on yourself in a positive way.
I feel for those of you who have great relationships with their in-laws, because you are losing not only a spouse but also a family. In my case, thank goodness, my H's family has never been emotionally there for me (or ask after me or call -- even after my brain surgery). H's dad has been there for us in a pinch, physically and financially, a few times, but there has never been an emotional connection. So I guess I'm not losing much in that regard. Turns out my H is just like them (surprise!).
M: 43 H: 39 D: 14 Married 15 Together 16 BD: 6/2014 S: 8/2014 OW revealed 10/2014 Instigated dissolution 12/2014, in progress So over it!