My 13 Yr Old Daughter Was Diagnosed W Graves' Disease

My 13 yr old daughter was diagnosed w Graves' disease this past June. Oct 4th she had surgery to remove the thyroid only. The parathyroid is still there. Ever since she was diagnosed in June she has has acute abdominal pain. We went to a gi who has done an endoscopy and biopsy (all good). She has also had a synogram of her intestines (all good). They finally "chalked" it up to anxiety. And yes she had a ton of anxiety/stress/ and closer to surgery ....panic attacks. Today is October 23 that's almost 3 weeks after her surgery and she still is experiencing acute abdominal pain. She now is taking levothyroxine meds and that is all. Her blood levels are all good. What else can I look for?