My daughter has had a blocked nose and cough for more than weeks now. tried over the counter meds, no improvement. now she has a fever?

Infection: She likely has an infection due to the fever. It maybe a uncomplicated respiratory infection either bacteria or viral, pneumonia, Tb, or allergies. The possibilities with the new onset fever point to getting her a doctor visit, complete exam, labs. Likely will need antibiotics directed at the source of the fever. Please get her medical attention soon.