I really have no idea that sounds hard!! Can use ask what type of activities she did at home over the summer? Does she have a favorite toy or blanket she can bring from home to have with her?

The eating? Do you serve milk or juice I would only serve water till she eats as she could be filling up on juice/milk. Are you serving new foods? Maybe check what she ate during the summer.

I think she is depressed she had mommy all summer and now she doesn't that must be so hard for little kids to understand? That is all I can think of oh if she is the oldest are the toys maybe to babish for her?