C.S.
Coughs and stuffy noses in children can last 4-6 weeks. I know it sounds like such a long time but that is what my pediatrician told me when I was concerned with my boys have a cough or congestion for more than a week. That is if it's a cold.
She could also have a runny nose and fever from teething. I know several parents who's kids always had runny noses and fevers due to this.
I hope I was able to give you some relief. Good Luck C.