My MIL LOVES her grand babies and wouldn’t intentionally hurt/abuse them.

BUT she does accidentally hurt them and it’s starting to piss me off. I have 8 month twins and she occasionally comes watch the kids while I run errands or whatever. She tends to cross personal boundaries a lot, but I’m always cordial and try to make her feel welcome when she visits. It’s been a few days since she has been over so hubby and I invited her over for dinner. After dinner we watched a movie and I asked if she would mind watching the kids for brief time while I help hubby with some yard work outside. She of course said yes, she loves any time she can watch the kids, no joke. So we go outside and she is inside with our twins and we happen to have the house windows open, so we can hear everything too. Well suddenly I hear my 8 month son screaming like pain scream. I tried not to panic and didn’t say nothing, my husband didn’t either. Then a minute later I hear MIL calming my son down and she held him up to the window. She said she was sitting on the floor in the living room and my son started to crawl across the kitchen tile and she grabbed him by the leg and pulled him back in the living room. When she did he lost balance and smacked his head on the tile. He has big knot there that’s all read and he also has a scratch on his chest that will scab I can tell he bled. I showed my husband and he said the cat must have got him. ...our cat has never scratched our twins, in fact, our cat is very gentle with them like a nice dog.

A month ago my daughter has a mark on her thigh like a pinch. I sent a text to my husband and his mom reminding them to please be gentle when changing her(I was at work that day) because she looked to have been pinched. Well she freaked out and thought I was saying she was abusing the kids and swore to my husband she would never. He later got on to me saying I made it sound like she was abusing them. I know shit happens with squirmy kids but cmon! Idk how to address this politely. Please help!

Also my husband isn’t going to speak to her about any of this because he doesnt want to upset her.