Alot of people, including myself, have had fabulous success with Petzlife Cranberry Fields Shampoo & Conditioner. It contains Cranberry Seed extract which has 100 times the healing power of Vitamin E. You can get it at
www.beyondspoiled.com. A member of YT owns that online store and she ships out super fast. You should get it in max 2 days.
You also need to check her food to see if it contains corn. If it doesn't a ton of dogs are also allergic to soy, milk, gluten (wheat, rye, barley), and beef. If the food you are feeding her contains any of these products, I would suggest switching.