My MIL is currently not talking to us! Yippee!
A few hints why i am so glad:
When DH had depression (I am sure she was root cause) phoning him up after a suicide attempt and telling him he had nothing to be depressed about, he should try her life, and he was pushing her over the edge
Cancelling (or trying to- are we stupid?) the wedding photographer we had booked in order for her gardener, a hobbyist, to do it. Yeah, right.
Faking a faint due to menopause (the woman had an early menopause from hysterectomy ten years before) at the wedding, insisting on being taken home, then making a grand appearance during speeches- on our wedding video you can clearly hear DH's Aunt saying 'Bloody woman always needs to be centre of attention! (hee hee)
Disarming alarms in house that FIL had set, so allowing 12 month old DS3 access unsupervised to her very deep pond (we weren't there, last time she babysat)
Watching her dog bite DS2 then giving it a cuddle and saying 'ah, nasty kids in our space?)
(FIL threw dog into garden in disgust)
There's more but I won't keep you.
The only thing I have learned- and Is till get very upset and keep expecting her to change, and then being heartbroken when she doesn't- is to tell myself the woman is evil, repeatedly, and she has no friends because this isnhow she treats everyone. We keep our distance as much as possible, I won't talk to her on the phone or relay her cruel messages to DH, and letters get stored until we are able and strong enough to deal with bitchy contents.
it's sad, but it is definitely not our fault,
and it isn't yours either