Honestly, if I were you, I would trust the teachers, family members and neighbours cos it's impossible that all of them are in cahoots. I would send the helper packing. I don't need physical evidence to occur before my very eyes then I change. She is good only in front of you cos you are her employer. It's not easy to find a good help but weighing the danger of my child's life in another person who doesn't seemed to care is too pricely.
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I would trust your gut instinct. Perhaps also spot check on her by appearing unannounced at home or at the school meeting them halfway to see if there's any truth in what other folks say.