Diet modification can often help even if that is not the primary cause. For the dietary modifications you might want to try a grain free diet for a while. In Chinese food therapy you would not want to add more heat if her skin is already hot. Cooling foods would be fish or turkey. Beef is neutral. Chicken or lamb are warming. Of course only use foods that are not allergenic.
You might want to look at some of our products to help heal the skin. Derma-IonX which is an oral homeopathic product stimulates the enzyme systems in the body which reduces itching and inflammation, promotes healing of the skin and helps with assimilation of nutritional components in diet and supplements. The supplements I use along with it include Canine probiotics, vitamin C, MSM, and Omega 3,6,9. Together with Derma-IonX it produces a synergistic effect for a faster response. I would also suggest that you give your dog only filtered water for drinking and bathing if your water contains chlorine or fluoride.
Defendex shampoo which is nontoxic washes away debris and soothes the skin. Using these products is a simple and effective way of helping resolve a difficult condition. One last thing, has your dog been tested for thyroid disease? This too can affect the skin.
Please feel free to contact us again if you have any other questions.