Rule breaking MIL

Ra

My baby is a little over a week old and we have just allowed our parents to visit, washed and masked. My mother in law decides to slip her mask off when she thought no one was looking... multiple times. (As soon as I would make eye contact she would put it back on) But only when my boyfriend was out of sight. 😡 I said something to my boyfriend who said “she’s just adjusting it”. Bullshittt! I’m so mad I don’t want her to visit anymore. He did end up saying something to her and what do you know she did touch her mask at all after that. Just have to rant because I don’t want to cause any issues but if she can’t follow this one rule to keep our baby safe what else is she going to pull?!