Some ADHD meds will suppress appetite and lead to delayed (not stunted) growth. The children are supposed to grow to normal adult heights, just a little slower. If you decide medicine is the way to to for school, you don't have to use it over the summer. If you don't use it over the summer, she may do most of her growing over then. Some ADHD meds have been shown to suppress appetite for a short while after they're started, but the the appetite comes back.
My ds takes Vyvanse. He doesn't eat much in the morning, unless I get the food into him early. He eats a small lunch, but many times he eats a lot for dinner (when the medicine has worn off).
