My mother in law was fine until about a week before the wedding. Then she paniced about her son being taken away from her and never seeing him again. In this panic, she did far more damage making it far more likely that he'd run 10 million miles than if she'd stayed quiet and hung in there!
She peaked in evil about 6 months after the wedding, and its tailed off over the past 12 years, a turning point was when our marriage was officially a longer duration than the one of her eldest divorcved daughter.
She still has nothing much to say to me, but that's okay, she doesn't live nearby and I just maintain my cheerful friendly bantery indifference as I have always done.
Husband finds her a pain in the arse and has little to say to her anyway, and he never really did, which is partly where her panic set in I suspect.
Shame, really, as I don't have family nearby and we could have been a nice supplement to each other if it had been mutually agreeable.