I swear by echanicia (sp?) with golden seal. Great emune (sp?) system boaster and even effective when in the throughs of it.
My son has asthma and it always triggers a cough and sinus congestion. First sign of a symptom... laboured breathing, dry congestion and we're putting drops in juice 3 or 4 times a day. Lots of liquids... especially water is key for asthma. Specially in winter when the heat gets turned on in the house.... specially if its forced air or wood stove heat. The worst conditions for an asthmatic.
Hope she starts to feel better soon. My prayers are with her and your family.
Happy Thanksgiving to you all.