My daughter is smart and engaging.. I have tried many approaches to get her to listen. For the most part, she is okay at home. However, at school, she has been hitting and spitting on her teachers and the other children. She yells and appears to have a lot of pent up anger and frustration. Is this developmentally appropriate behavior or should I be concerned. She just entered a new pre-school program but she has been in daycare for most of her life.