Am I wrong?

My girl is now 5yo. All the while (the past 4 years) I have been saying " when you are eating don't talk. BC you might get choked with the food." But, mil always talks to her only when she is eating or she is in the toilet showering. Why my Mil only talk to her when she is eating or showering?? I'm not saying totally can't talk but mil is talking to her the whole time my daughter is eating.. laughing.. playing.. Mil will push open the toilet door and laugh at her. But my daughter is shouting (scared) and say close the door I'm showering don't see me! She will laugh and talk to her. I'm so sad that I can't protect my girl. I told my husband and I want him to talk to his mother. Don't ever do it again. is very creepy! My girl hanging mil peeps on her and making fun of my daughter not wearing clothes. Excuse me!!!! Wtf you want?? I'm here teaching my girl how to protect herself don't let anyone touch or see her private area. And yet you give her the wrong guidelines. As a woman we always protect ourselves. Never let anyone touch or see our private area. Haiz .. speechless