Hey There,

I am not too sure if there is a test they can do, but I was only diagnosed with sinus/hayfever last year simply by my symptoms (i was put on a mini steroid type pill to help me get over it)

Perhaps get your DD to take a claratyne or something similar when she has these bouts, if it makes her feel better and relieves her symptoms you'll know

I have a feeling my DD suffers it too but she also has asthma! AND to make matters worse, we have about 8 wattle types tree's that are in FULL bloom at the moment so we're all sneezy and watery!

Good Luck