H.R.
I had sorta the same problem with my mother-in-law. me and my husband asked her to come to our house to watch my son, who was about to turn 2 at the time, while we went out. We were only gone about 4 hours. She gets on my nerves anyway because every time she comes over to visit she starts cleaning my house like i don't do a good enough job. Well when we got back from our little outing all that ended. She had been so busy cleaning my house to her liking while we were gone that my child had 4 hours of poo and pee in his diaper and it was running down his legs! I was soooooooooooooo mad! She even had shut his bedroom door so he wouldn't get his toys back out and make a mess! I can't even tell you how mad i was! So ever since that day she has never kept him alone and she doesn't clean my house anymore. we had a big talk about that, that day. Maybe you just need to go to her and say look here woman I don't like the way you look after my kids! or find someone else to keep them like i had to do.