Next step. Set and enforce a firm boundary there. You don't need the drama. It is pointless to involve yourself in it.
"MIL, unless it is a clear emergency or it involves the kids, I don't want to know. H can share whatever info he wants to. Otherwise, it is none of my business and I prefer to keep it that way."
Glad FL was good for you. I hoped it would be. I am sure you can round up DBers for a minibreak for an upcoming weekend too if you need a refresher!