I think a couple of things could be going on.The younger ones could be irritating her,she probably senses the new baby and she is 2 1/2. Welcome to the terrible twos!
First of all, realize your child is completely normal and it is not a reflection of your parenting. Just the fact that you are reaching out shows how much you care
. My daughter went through this same thing at the same age (and I was also pregnant at the time). One of the things that helped was showing her how to touch nicely or not at all. Also, if she ever hits you at home, overreact! Act like it hurts so bad and even fake cry. She may not understand how she is effecting others.
Hang in there and just work with your provider. I'm sure that this can all be worked out and in no time this will be something of the past. Hang in there!
