I have switched her food to Natural Balance Potato & Duck. She's been off of Science Diet for well over a month at this point and the food switch does not seem to be making a difference. I'm not sure how long it takes, but I had expected to see at least some progress by now.
The vet says that our next step should we choose to do it, is to get her tested and to go on allergy shots. Not what I wanted to hear. I'm hoping we can get this under control without going down that road.