DD will soon be nine. She is very slim. She is the shortest in her class. Today she was upset at being called small. Her friends are saying she is small and saying things like you have small feet. I am sure they don't mean anything by it. Her best friend is actually skinnier than DD but a bit taller. These comments are bothering her. She wants to be taller and bigger like the other girls. What can I say or do to help her feel better?