Uhh mother in laws

Why do mother in laws have to be so dang irritating when you have a baby. I've been raising other people's kids for them for years, I'm pretty sure I know what I'm doing. And I have my beliefs on how things should be and apparently she doesn't agree but I'm doing things my way with my children. She clearly doesn't know what the hell she's doing since 2 of her kids are bat shit crazy!!!