Saline nasal spray to help loosen the muccus + nasal aspirator to suck as much muccus as I can + heaps of water or Hydralyte. At night time, I put a vaporizer + rub Vick kids on back and chest. You should get her check as well as it could be hayfever due to spring. If so you may need to get Telfast.
Run the shower and allow the steam to loosen her mucus so she can breathe out her nose