T.H.
I would go directly, but kindly, to the director. He/she needs to know. It's possible that the worker may be having personal issues,etc that are causing her to behave this way, and temporarily, I could perhaps make allowances for that myself. That would be something you and the director would have to decide for yourselves. But, if it was a regular on-going problem, she needs to be told that this is not an appropriate way to handle ANY job. If she doesn't like dealing with 3 yr olds, then she needs to find another line of work.