SJS, I have to agree that just because a babysitter is frum doesn’t mean she is capable.
I lived in a town where there were no frum women who provided childcare in their homes. Most women hired non-Jewish sitters to care for their children in their own homes. I hired a frum woman to care for my infant and toddler, thinking that this would be better than a non-Jewish sitter. One day I came home from work (8 hours plus commuting time) and she told me that my daughter hadn’t drunk her bottle or anything else all day. I asked her why she didn’t call to tell me this at work, and she shrugged. When I questioned her further I realized that she’d been offering my daughter the same bottle all day, without washing and refilling it. Of course my daughter refused refused it, because it hadn’t been refrigerated all day and was spoiled.
That day I told her it wasn’t going to work out. Afterwards my neighbor told me that she had seen the sitter neglect my children and had been concerned, but didn’t want to tell l”h on a frum person.
After that I sent my children to a Jewish daycare center. It was more expensive but they received excellent care.