Amazon.com: ADMS Anti-Allergen Spray 32 oz.: Home... Amazon.com: 8in1 Perfect Coat Dander Control...
If you search the internet you will see various products that are used for allergies and pets. I would just be careful that what ever you use on your pet is not too drying to the dog's skin. There are also sprays that you can spray on the coat between shampoos to control dander. Too much bathing can also create a dander problem if you are drying out the skin. Dogs that lick a lot can create an issue because of the saliva. Of course dogs that are comfortable don't lick much so make sure their skin stays healthy. Kids with allergies usually have sensitivities to more than one thing so trying to eliminate the other problems will reduce the assault on her system. Hope things work out for you and your family. I went through this with one of my kids.