C.H.
I would have her tested for allergies and get her in to see a pulminologist. My son has been seeing one since he was 15 months old b/c he couldn't get rid of a cold for 6 months. They found out he was allergic to Oak, dust and dogs all of which he was around and participated in him not getting better. My son goes to Sr. Sawicki at Children Hospital he's great! When we lived closer to RI he went to Dr. Passero in RI she has a rough bed side manner (very blunt) but really knows her stuff and got my son on track within weeks. My son is going to be 6 in Feb and is heading into this winter on zero meds thanks to all the doctors help. If you need anymore info let me know. Good luck.