Hi
For your daughter, you may give
Acetaminophen every 6 hours for 2 to 3 days in right dosage. This will help for her headache too. For
nasal congestion and occasional cough, you may give Tab.
Cetirizine 10mg- half twice a day for 3 days. You may also ask her to try steam inhalation.
It might be a viral rhinosinusitis. In such a case she will be okay soon.
But if she develops high grade
fever, her appetite is poor, she is lethargic, cough is distressing, nasal discharge becomes purulant, headache is severe, she develops
vomiting etc- please do not hesitate to visit your doctor.
Hope my answer helps you.
Wish your daughter a speedy recovery.