Please don’t get offended..but I am really, really curious. Is your mom someone’s mother in law too? Think before you write or say something. And the way you talk about your MIL, that’s unnecessarily rude. Would you tell your own mom to shut her mouth??? Why is it so hard to respect your own husband’s mom. If her close relation to your husband means nothing to you, then at least respect her as an elderly lady. Our religion tells us to be always respectful towards our elders.
So what if she gives you unwanted advice, you can politely listen. It wouldn’t kill you.