B.C.
Humidifier at night
Steamy showers to steam up her sinuses.
Rinse out nose with warm saline using a neti pot
Gargle with salt water
Try home made chicken soup - that other stuff is full of salt.
Forget decongestants - they thicken the mucus and make it harder to expel.
Stick with expectorants - Mucinex or Robitussin.