Give HEPAR SULPH 6c & KALI BICHROMATUM 6c alternately every two hourly three times each in a day for at least five days. It might establish some discharge from the nose let it flow & do not try to stop it.

Actually the Sinuses are filled up with mucus & need to be drained first.She will feel better after this & then as the discharge reduces let us know we shall decide what to do. Even if the discharge is not there she should feel better with these medicines. She can inhale plain steam without any medicine to get some relief.
I tried many times Kali Bichrom 30 and found to be working consistently...