S.L.
What is she doing? Does she sneeze, itch, rub her eyes or what? I know I have have had allergies for years and my grandchildren, some of them, are extremely bad with seasonal symptoms, food allergies, asthma, etc. They are on pretty much what your daughter is on except some take Zyrtec plus singulair and in the beginning some were on prednisone for a short time to get it under control. I would maybe see if that combination of Singulair and Zyrtec works for her if the doctor could let you try it. Also maybe Nasonex is better than the Flonase. They switched me to that and it seems better and I heard something not good about the Flonase. They're very similar though. Sometimes you have to play around with the medications to find the one that works for you best.
I hope you find a solution as allergies are very miserable plus medication expensive and sorry you don't have insurance. There must be some way to get samples to try other things and go from there.