Thyroid tests normal but my 6 year old is still having issues

In September 2012 I noticed that my 6 year old daughter's hair was breaking and thinning terribly.  I made an appointment at the pediatrician and they suggested that I have a blood test taken.  Her tests came back with slightly elevated T4 levels.  I took her to an endocrinologist at Childrens Hospital of Philadelphia where we were dismissed as no thyroid issues were present and her lab tests came back normal.  My question is, is it possible to have a thyroid issue, in a young girl, without the blood tests being positive for thyroid issues?  She is irritable, very sensitive, hair thinning and breaking (not losing hair), and a fairly healthy eater but gaining weight.  Any suggestions?

11/20/12    TSH 2.53   T4 12.7  (6.1-12.2)
1/14/2013  TSH 3.24   Thyroxine 8.8      FT4 1.0    Thyroxine binding globulin 15.5

[goolarra]

You don't have to be out of range on tests to not feel well.  What are the ranges for thyroxine (TT4), FT4 and TBG for the second set of tests?  Ranges vary lab to lab, so if a different lab did them, be sure to check those.  

Did they test anything else at all?  Antibodies (TPOab, TGab, TSI)?