sometimes it has to do with the internal environment of your house/apt. I change my filter with one of those 3 micron filters every other month, and I dont have pets. Also try a neti-pot. LINK They can be had at most cvs/walgreens for about 10-15 bucks.. also helps after shooting at precision since their filtration system is getting worse
Give her soup/gumbo, with an excessive amount of Tony's on it, to clear her sinuses. To help her throat, have her stand in the shower with the bathroom doors closed, heater on, and water as hot as it can go, and breathe the steam.
Both of my older boys had croup this week, and this has worked for them.
Use the vicks vapor rub if she does this...the steam + vapor rubs clears the sinus!
Isn't she a nurse...tell her to just get a shot!