MIL will not stop nagging us to babysit!

Succulent
The more you engage with her the more oxygen you are giving her: cut off the oxygen supply.
Remember: no is a sentence.

Children are not parcels to be doled out as gifts to whoever decides they want time with them.

Succulent you don't have a mother in law problem; you have a husband problem. Stop trying to deal with it; it isn't your circus; it's your husband’s. Norah has given excellent advice; stop engaging with your mother in law, stop taking her calls; grey rock all further acts of communication from her and tell your husband to man up and deal with his responsibilities.

Sadgrandma

Why don’t you and your DH both sit down with you MIL and tell her how nice it is that she has such a close relationship with your DD and that you really appreciate her offers to babysit. However, the constant nagging is getting very wearing. Therefore, you would like to suggest that you arrange a regular fixed date, perhaps once a month ( or whatever you feel appropriate), but do make it clear that other times will only be in exceptional circumstances. This will give your MIL something to look forward to and some sort of structure to her life, which appears rather lonely.

I think this is gread advice.

A regular, once a month babysitting date will give her something to plan for and she might give up the relentless nagging.

How does the Child feel about the situation and the prospective babysitting?

Maremia - my daughter definitely loves her grandma! She seems fine letting us set the pace when it comes to visits though. She is happy when we plan a visit but she doesn’t ask to see her or bring her up or anything.

Bless her heart 🥰. Five year olds are very perceptive and she has probably picked up on the situation. She won't want to upset you by asking to see her grandma or bring her up in conversation, she sounds a well behaved and lovely little girl 🌷. I'm glad she loves her grandma 🤗. Please let them have a relationship, it will benefit you all in the long run 🙂.

I would just call her out, "MIL you've asked me 10 times in this visit alone if you can babysit. If you keep asking relentlessly, we're less likely to ask you, not more likely. You haven't babysat until recently because you have pushed boundaries and ignored rules around our child. Despite this we have trusted you to babysit a couple of weeks ago. Please respect that trust was broken before and it takes time to rebuild. You will be able to babysit again but it will be when we feel ready, not when you push for it. Also, please stop talking through my child and telling child to ask me when they can come for a sleepover. Every time you do this, the answer will be no"