How can I tell my mother in law to back off?

Kind words are always a great way! Simply telling her you aren't interested in her advice/criticisms, or that you'd prefer if she'd give you some space should be enough. Try not to say anything harsh - she is after all, your spouse's mother.

Perhaps do it a gentler way do it in a way she can understand explain why she is hovering or making you feel uncomfortable

Sit her down and have a one-on-one conversation as adults. Tell her exactly how you feel. Be mature.

You could politley ask her to come have a cup of coffee and sit her down and talk to her about some pivicey

Speak with her in a calm and controlled manor explaini g your thoughts and opinions and discuss it like adults.

Far too often, you feel the need to give me advice. You say you’re just being helpful. Even when I tell you, “no, I’d like to do it my way.” You retort by reciting your mothering resume. Telling me how many kids you’ve raised. Constantly reminding me that you have “experience” and “wisdom.” Well, can I be frank?You’re not helping. I say this out of love. I say this out of respect for you. And I say this so that we can become the family I envision where we enjoy each other’s company and work together to create a positive environment for the kids.

Tell her strait up to back off and keep saying it until she does. Or talk to her and tell her how it is affecting you

Try to get her to understand she isn't your mom, she is your mother IN LAW. So her judgement is not as strong as MOM's would be.

i think you should just politely say that you can handle whatever the situation is yourself and if you do need help you can just ask her.

Express politely that you feel she is, for lack of a better word "in your business", and ask that she please understand that you have everything under control by yourself.