Many dogs have a wheat allergy. Check her diet. If she is on wheat based 
food, change to a rice based or pure protein food. And, do not buy grocery 
brand dog foods. They're junk! Buy the best holistic dog food you can 
find. I use Azmira Lifestyle available from 1-800 PETSMEDS.

I discovered this with my last dog who had severe skin and odor problems. 
Trashing the wheat based foods and switching to rice based food cleared 
him up in a matter of days.

Maranatha,

Bob