One of my middle sons was diagnosed with asthma at age 2. He was on steroids 3 times a day (Pulmicort and Singulair), and albuterol breathing treatments in the afternoon or as needed PLUS was on Claritin daily.
He is allergic to dust, mold, pollen, cut-grass and a few others.
We went back and forth for years...a seesaw of good spells followed by terrible ones... finally, at age 5 I had had enough! My son was over reactionary, subject to bouts of depression, and had other issues that I finally realized could easily be linked to side effects of the medication he was taking... I wanted to know who my son was without all that junk in his system.
So, I started cutting it back (you can't just stop a steroid or you will trigger an attack) I had developed a fairly good knowledge of holistic and herbal remedies and wanted to try him on a more natural treatment with fewer side effects. I wanted to let his system clear out for a few weeks before switching to the new regime I had planned.
...but you know what? As soon as I stopped giving him his over the counter meds, his allergies improved dramatically all on their own. I never did start that daily herbal regime either :) Now if it is a bad allergy day, I give him some over the counter Claritin (he likes the taste better than some of the teas I have him drink) and just add the herbal supplements if I have to. I also do watch his diet when his allergies are active, to be sure his immune system has the best possible building blocks - lots of vitamin C, yogurt, fresh veggies, etc. We almost never have trouble any more. He's had one ear infection in the last two years and one asthma flare up (down from several each month). We have two cats, a dog, I have a huge garden with lots of flowers (though we do close the windows and encourage him to play inside due to their sheer numbers when the pollen index is high) 99.7% of the time though, he plays outside at least as much as the other kids with no problems. :)
I'm not saying things will work out that way for everybody, but a more natural approach helped my son out a lot, and freed him from the steroid cycle of crazy ups and downs (both physically and emotionally). Holistic methods are worth checking into, and if you can find a good holistic or holistic-leaning doctor in your area, I think you owe it to your daughter to investigate those avenues as long as you are comfortable with it.
Good luck!