Its not uncommon for adolescent for being misunderstood.
The kids needs a one to one talk or outing to discuss issue. i am sure she will open up. Then only we may think of a counselor than a psychiatrist
. At times do talk to friends and teachers regarding similar issue in school, if not then you need to work hard to understand her.
Also the illnesses that may result such symptoms are iron deficiency
, thyroid deficiency
, and obesity.