I hope you don't mind one more reply. I myself have allergies to cats,dogs,dust,pollens, perfumes, etc.
Claritin or Claritin D does NOTHING for me. It also did nothing for my 5yr old sneezing all the time, and itchy.
Could you try Zyrtec now that it is over the counter? With my son, just a 1/2 tsp. every night is enough to help him. When he gets a cold, I up it to a tsp. Course he's only 40lbs. Zyrtec can make you sleepy, so take at night, and it lasts 24 hours. He takes it year round. My son's allergist also says Claritin is worthless. Good luck. I hope she can get relief.