How to handle a mother in law

For me, when she does it for the first time, I will ask my husband to either go handle his mother or I will. If I have to step in, she can forget about her grandchild until she changes. How will my kid think of me when she keeps saying all those nonsense. I was damn timid before I have a kid, so everytime my mil do funny or say hurtful things I just keep quiet. Now, no chance. I remember packing all our stuffs and we ignored and cut her off for 3 months until she came and say sorry. From then on, way better and don’t dare to anyhow. You give me 1 I give you 100. Kids are very smart, they usually know who (grandparents especially) will give in to their 1001 requests regardless while we parents will limit. She is welcomed to babysit her husband 24/7 at her place since he is her child but don’t come and talk nonsense to or snatch my kid. It is MY kid. And tbh, you’re just my mil. I respect you as my husband’s mum but it works both ways. Stand up for yourself 💪🏻.