If it were my daughter, I would get a second opinion. You need to ask questions of the doctor b/c they do not offer much in the way of info...at least some do not. I would just think of all of the questions you can think of and write them down, then ask away!! You are paying for the doctor's time and expertise and he should give you all the info that he can so that you and your daughter know what is going on. Good luck and let us know. I hope she is feeling better!
Any chance of mono? My daughter ran a low grade temp. for about a month before they agreed to test her. She was in her first year of college and the test turned up positive. She was very, very tired and as I recall she had a cough. Just a thought?
Hope she is feeling better very soon.