I'm sorry to hear about your daughter's sleeping problems. I'm not sure what state you're in, but here in PA, my allergies are horrible!
Have you tried giving her Benedryl or another allergy med througout the day? I know the problem is only at night, but if you get a steady dose of medication into her, it might help. Or maybe give her Benedryl right before bed will help her get to sleep and stay asleep longer. Please be sure to check with your doctor before giving her anythng--some things may contain aspirin which they are not to take for a while after fusion.
Have you tried running a vaporizor in her bedroom or maybe a cool mist humidifier?
I don't really have any answers for you, just suggestions to try. Please remember to rest and take care of yourself.
Mary Lou
Mom to Jamie age 21-diagnosed at age 12-spinal fusion 12/7/2004-fused from T3-L2; and Tracy age 19, mild Scoliosis-diagnosed at age 18.