C.S.
I'd keep an eye on her. But I bet it's because of the tooth. And soon she may get another. I remember DD got her first 4 teeth pretty much one after the other! My DD didn't always have a fever, but sometimes she would have loss of appetite. It may be like this for you the next couple of years. My daughter is just now getting in her last set of molars...and I hear those the extreme painful ones! :) Best Wishes to you!