MIL talking crap about me on MY Facebook! What should I do? If anything?

I've never ever been disrespectful to my in laws. Always been good to them... but Monday night she over stepped. My DH is her one and only child. And lets just say, for a man in his 30s w a wife and 3 kids... she REALLY needs to cut the cord already. I mean, its bad.

So, Monday night. DH took my kids over there. Ive recently started dental school after years of back and forth of working towards a bachelors and being a SAHM to my 2 very small children. And he took the kids over there so i could study. Long story short, i wound up having to go over there to pick my kids up at 730 pm bc my DH was drunk! (DH and i have had our problems this year. His drinking, staying out, not helping at home, not even being home at that, among other things) While i was over there I walked out back to talk to my DH and we wound up arguing . my MIL secretly FOLLOWED me outback to eavesdrop. By the time I got home, I had the following comments written and posted on MY FB page.

If it seems that she is arguing with someone, its bc my bff got on there to defend me. Also, the "different bitch" comment is her comparing me to my dhs ex wife. The last pic was HER personal fb post, screen shot and sent to me by a mutual after i deleted her.

I haven't been in contact. I dont plan to either. I also don't plan to send my kids over there at ask anymore. There the type of people wholl talk shit about me in front of my kids. Frankly, I'm waiting for an apology. Although i dont think itd mean much, or that id even accept it.

What should i do? If anything? What would you do?