Well, without knowing spefici numbers, it is hard to say. You MUST find out what specifically was tested and what the numbers were. There are several different thigns that can be tested for Thyroid. Most likely, her TSH was tested. She should also ask for: Free T-4, T-3, Antimicrosomal Antibodies, and Antithyroiglobulin Antibodies. This will give a more complete picture of the Thyroid.
The symptoms of Wilson's are varied - many can be easily explained WITHOUT involving the Thyroid. Without a FULL blood workup, it is impossible to tell. You HAVE to ask for more bloodwork, and KNOW the numbers. Without knowing the numbers, and knowing what is a normal range, then you cannot diagnose. Discuss these possibilities with the doctor.
When my bloodwork came back, my doc referred me to a specialist. He discussed everything with me, including symptoms and medicated me. My numbers were not crazy low, but when combined with my symptoms, medication was necessary. He also ran a complete blood panel on me, and ordered an Ultrasound. This is necessary to get to complete picture of what is going on.
DISCUSS these symptoms with her doc. If she does not discuss the symptoms, then s/he will not get an idea of what is going on.
As far as temps, some people just have a lower body temp. 98.6 is just an average. Not many people are 98.6 normally.