M.D.
Chocolate - oh, wait, that's what I would want.
My 15 yo girl would like spa stuff or art supplies.
What about a tea cup and a tea bag with an invitation to a make believe tea party? You and she can sit down at the same time and have a cuppa, even if you are miles away.
Movie pass (or Fandango or movie rental GC) and a bag of microwave popcorn.