I used to haaaate what I saw as 'MIL bashing' threads on here, but now realise things are a bit more...nuanced. Mine is kind, but also a pain.
Anyway, new baby coming soon and we've been thinking of removing DD's dummy for a while - because of all the usual stuff, plus didn't want to try taking it away with a baby around potentially using dummy too. We did the whole dummy fairy rigmarole, she was pretty upset but starting to accept it - hideously early mornings though😪 We told MIL all of this obviously, and mentioned that we have got rid of all dummies in the house so we're not tempted to give in. DD came back with MIL the other day unusually bouncy for that time - she never normally naps there - and MIL was full of the joys of a 1 hour nap. I said something like, wow that's great! I haven't been able to get her to nap without the dummy. And MIL got all coy and said, 'Well, we shan't tell Mummy about what we did', and it became evident that she'd just given her a fucking dummy. So weary of her, and it felt like it messed things up as DD was a nightmare to put down that night. (Maybe she would have been anyway! But it didn't help.) MIL annoyed that I was annoyed, and says she can do what she likes in her own house - which is totally true, but also just shitty of her.
I know the answer is to stop her looking after DD and use nursery for an extra day, but she'll be so angry and upset about it, and insistent that we don't want to see her etc. Just so weary :/ I don't even know what the AIBU is, sorry.