Sorry OP, that really sucks :/ Hopefully things will work out for the best, either way...

You should have an open discussion with them both. I'm sure your husband isn't enjoying the friction between you two.

Talk it over with your husband. What is his relationship with his mother like?

There's only one sensible solution to this problem. Go over to her house and shit in her mailbox.

There's a subreddit called "justnoMIL" which might be of interest to you if you aren't already acquainted. I hope you'll be okay.

YDI until you maybe explain why.....

id make a sex tape and send it to her

I call mine a hexenbeast! She shuns my wife for being gay. Does your hubby not back you up when she acts a bitch? Part of my wife's issue was standing up for me to her mom at her dad's memorial service. Huge hugs

Hate Trumps love.

I take it if she was on fire and you had to piss. You use the bathroom across the street