Maybe you can try.. After every shower, clean her nose with a nasal aspirator or a cotton bud to gently wipe out the mucus. Don’t push it in.
I don’t wash my baby’s hair for evening shower because we sleep in air con and medium fan. All of us sweat a lot. Wear clothes that don’t expose her to direct fan/air con. Apply balm at the soles of her feet, her chest, her tummy, her back.
And also, try adding vitamin c into her diet.