I’ve caught my MIL referring to herself as mommy multiple times, how do I address this?

And I would nix that mama stuff as her name asap. This is likely a bullet point on a long list of things she will do in the future

yeah there are no boundaries, everything I do she has a comment about. Unfortunately her other grandkids call her mama so I sucked it up

definitely dont just suck it up. even if her other grandkids call her mama that is YOUR kid and of you are uncomfortable with it then end of story. i know its hard cause we always want to please mils but sometimes you gotta put your foot down. it may be her grandbaby, yes, but it is YOUR baby, not hers. what you say goes

HELL NAH.

My niece and nephews call my mom "Ma" and so my mom said ours could call her the same. It was a hard no. She has a mommy and a mom. I let her know the options.

You need to sit her down and tell her that you compromised on mama and now she's overstepping AGAIN by referring to herself as mommy and that moving forward she will only be known as...and then list options that work for you. If she has a fit, remind her that she is a mom and from one mom to another surely she understand the sacredness of that word and it's a no. Thats it.

Honestly, your husband should be checking his mom. She’s overstepping and making you uncomfortable. The only person your kid should be calling any word centered around mom, is THEIR MOTHER. I’m sorry, this just kinda makes me mad for you. Her behavior is hella weird.

Hellll naaahhhhh. Set boundaries asap and if she doesn’t listen I’d be stopping contact till she learnt. You respect me as a parent thank you.