I agree that if she doesn't feel she has lost "enough" weight, than she will risk being discouraged enough to stop exercising completely. It is easy to drop back into old habits if you don't see any (or "enough") visible progress.

Maybe the doctor can give her a pep talk, even if he doesn't give her the thyroid meds?

Me: 41, INFP
Her: 46, ESFJ
Married 6/95
B-G Twins
4 yrs recovered from serious neglect on my part.
So happy together!