What is she allergic to and what food are you feeding her? You may want to look at her diet and also think of adding omega 3's and 6 into her diet with either salmon oil or flax seed oil. Also what color is she? From what I hear the blue dogs are more prone to allergy and skin conditions. I would really consider doing your own research as you are by asking questions and before you start hyposensitizing her with injections by the vet who will gladly take your money :-/. I have seen dogs who have had thinning hair and skin conditions due to allergies and once there diet was switched (high quality food/grain free) and proper supplements were given there dogs did a complete 360.
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http://www.gopitbull.com/health-nutrition/3749-pet-food-rating-comparison-chart.html
http://www.gopitbull.com/raw-foods/
http://www.gopitbull.com/health-nutrition/36127-supplement-sticky-why-not.html
http://www.gopitbull.com/health-nutrition/3749-pet-food-rating-comparison-chart.html
http://www.gopitbull.com/raw-foods/