What to do with BFs mom

Some shit popped off yesterday with my bf and his family.

Long story short him and his mom got into it on the phone over something that was strictly between them and she wanted to be petty and try and pull me into the middle of it.

He stood up for me but the fact she was trying to drag me under too was super uncalled for. I have done nothing but be nice to her and never stepped on her toes, if anything I’m the reason she used to see him as often as she did because I’d always tell him he needed to see his mom.

During the fight she just tried talking shit about me and my family (whom we only see once a week and we see them a few times a week because they’re 5 minutes down the road) and she’s never met them.

She also is apparently bffs with one of his ex’s. I’ve never had this much drama in my life, even back in high school.

I tried to keep this short sweet and simple. I am just clueless on how to continue moving forward with her later on. My BF holds grudges so I know we won’t be around them for a while, but I’m not just letting it go when that time comes either.

What would you do in this situation? I’ve never had a BF who’s family was batshit crazy and drama driven like his.