It sure sounds like she has food allergies. I, personally, would try feeding plain old chicken and rice for a while, then consult the list and start on a raw product or any limited ingredient (/?s=limited+ingredient+dog+foods) food. I like the raw because of the lack of additives.
My old (16, 13 and 11 yrs) dogs are getting a combo of Orijen freeze dried, Natures Variety raw and green tripe. We had some skin and coat problems and this seems to be clearing it up. It'[s not an inexpensive way to go, but neither were all the vet bills.
