My 4yr old daughter is sick again...should I take her to the DR

She was sick 10/12-10/20 with congestion, runny nose, fever, and a really bad mucas filled cough. She went to the Dr on 10/26 and was well enough to receive her flu shot and her H1N1 shot. She had no problems until last night, 10/28, at 9pm she developed a plugged nosed and a low fever of 100.1
The fever has lasted all night and all morning. It is still low at 100.1, but it is odd for her to have a fever that didn't break on its own overnight. Is this from the shot? Should I be worried? Should I take her to Dr? I also noticed that she has a rash along the inner side of her thighs, close to her private area. Other than fever she is not complaining of anything else. However, at her Dr.'s appointment on 10/26 the pediatrician forgot to check her ears. Could she have an ear infection? I've asked her if her ears hurt, she says no...help please!