Washing baby?!

How often do you wash your baby? Mines a month old & my mil is telling me to wash her every night..? I just washed her two days ago. She said it’s her house her rules.. i just remember being in the hospital and then telling me i don’t need to wash her so often because babies don’t get dirty. I was her two times a week as it is. it’s starting to make me feel like I’m not a good mom with someone always hovering over me telling me what to do with my child.. little rant & a question