My MIL has just been generally unsympathetic to my wife's mental health. We tried to be considerate because my MIL was raised in a different time where that kind of stuff was just shut away.

She recently said some very nasty stuff to my wife along the lines of "You won't be a good mother because of your mental health".

We've tried to mend that with talks but she never really understood the damage she caused. Giving half apologies like "I'm sorry you took it that way" or "I'm sorry you feel that way".

We haven't received a true apology and we're starting to accept that we aren't going to get one. She thinks we're overreacting and tries to act like nothing is wrong and tries to interact with us as normal.

So we finally set our boundaries for our peace of mind. And she's starting to get consequences from those boundaries.