MIL really wants to babysit my 8MO I just can’t do it

She keeps asking me to babysit her. Am I being too overprotective? When she was a newborn she used to piss me off so much with the way she handled her. She almost dropped her twice in the same day when she was a month old due to being careless. I noticed that she does try to be more careful with her now but she also has a hard time carrying my daughter around the place. Shes not the strongest person. She can carry my daughter but can’t do things like pick her up from the pack and play and set her down in there from the bottom level. My FIL also told me about how she dropped all her kids when they were babies but they turned out okay. Like what, I get that accidents happen but I don’t want that happening to my child. She’s buying toys for her house so that she can “watch her” I’m starting to feel pressure but I just can’t allow it.