Sick Baby?

Well, for the past year Ella has never been really sick (besides a cold or two).  But, last night she woke up in the middle of the night burning up with a fever of 102 degrees.  She wanted a bottle so I gave her one and then she went right back to sleep.  She slept until 9:00 which is very strange for Ella.  When she woke up she was laying in a pool of sweat and her fever had broken. I have no idea what it is?  She ran a fever earlier this week after her shots, but last night was out of the blue.  I thought maybe it could be teeth, but I'm really not sure.  We will have to see how she does the rest of today.  Poor baby Ella!