??? Wow, that sounds really weird. I'm guessing they checked her ears, and throat?
It could be a virus, my DS2 was 12 mths when he had a high temp, no other symptoms & came down with gastro a few days later.. we've had a few episodes like that... I think you did right getting her checked anyway.
I know what temp my kids usually run at around 36.5), I would class anything over 37 a temp and over 38 gets a trip to the doctor.

Hope she's better soon