Sounds like your talking about my daughter, and she has
ADHD. They started her off on Adderal XR, but she is now on Vyvance (sp). She did and does all the things you have listed, including the stealing and not knowing why. Your best bet is to try and find a peds doctor that specializes in ADD/ADHD. If she is found to have ADHD, so of the things she does might not go away, like the stealing.