Keep the cat for now, but be open to finding him a new home if it seems he is affecting her. I got a cat as an adult, and then I got three more. I adored those cats, esp b/c for 10 years they were my 'kids'. But my allergies became asthma, controlled by 2 doses of meds/day. I still wouldn't let the cats go. But the minute my last cat died (at age 16) my asthma disappeared. Suddenly I could exercise again, and be active, w/o panting. I lost 40 lbs, I'm an athlete, I'm a totally different person. I didn't realize what a toll the asthma was taking on me. It's not something I would choose for my child. Be extremely aware of whether your child acts different in environments other than your home, like on vacation in a hotel, or overnight at grandmas. For example, her nose isn't as runny, or when she runs around, she doesn't get as tired/ wheezy. Watch for clues that the cat may be affecting her. If it becomes necessary, you have time to find an ideal placement for your feline buddy.