I'd have to know what tests your girlfriend's endo is doing on her in order to know whether he's on the right track. I'd also need to know his recommendation after the blood work comes back.
Many of us with Hashimoto's have nodules on our thyroid, and most often, they aren't an issue.
Ranges for the various indicators vary from lab to lab, based on how they determine their ranges, and the units of measurement; that's why it's important for us to have you post the ranges, along with the test results. Often, just being "in range" is not good enough; each patient is different and what might be right for me, may not be right for your girlfriend.
I strongly suggest that you take a look at our thyroid forum, of which I am also a Co Leader. Read the various posts and comments. When you have a copy of her blood tests (always make absolutely certain that you get a copy for your records), please start a new thread in the thyroid forum, listing the tests, results and reference ranges from the lab report, along with any symptoms present.
Here's a link to the home page of the thyroid forum. To post a new question, just click the orange "Post a Question" button at the top of the page and start typing.
http://www.medhelp.org/forums/Thyroid-Disorders/show/73?camp=msc&personal_page_id=861625
Because too many people don't get adequate treatment for thyroid issues, I and the other members of the thyroid forum will do everything we can to help you and your girlfriend obtain the best level of treatment.