MIL Drama

So, my MIL has been awful since ai started dating my husband 4 years ago. Every time a major life event happens with us she gets worse. It has been nothing but judgment since my son was born. She's mad we named him after my grandfather, we didn't circumcise him, we won't make a half hour drive every week to see them with our 2 month old child, etc... The worst thing is though we found out I have PCOS and do not make breastmilk. This was really hard for me to except, and when my husband told her he told her not to tell anyone or bring it up bc I was still working through it. So what does she do...tell everyone that day and bring it up two days later at a family birthday party in front of everyone. Now every time she holds my son she'll say "oh you don't want those boobs theres nothing in there." And today "he's a bottle boy he likes the fake ones". And if this isn't bad enough she will rip him out of me and my husbands hands as soon as we get there. And won't let us have him back until we leave. I really don't care for her, and my husband doesn't like the way she treats me, but it's his mom. If it were up to me I'd write her off, but I can't ask my husband to do that. So, I can tell her off and deal with her backlash or keep my mouth shut and just see them as little as possible. I'm really close to going off on her, but don't wanna put my husband in an awkward spot. I know he'll defend me because he's just as upset, but I also know it's hard to tell your mom shes wrong. Any advice?