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First, it's pretty clear that the paw licking is not food allergy related. Food allergies are pretty far down the list of causes of atopy, and grains aren't the most common food allergens anyway. Plus, if the symptom is mainly on the paws, then it's probably not atopy anyway. Combine that with the fact that you've switched proteins complete in the food change, and food allergies are almost completely ruled out.
Second, pink or red fur is what happens when the fur is consistently exposed to saliva. The lighter the fur, the more obvious the effect.
Third, she's probably stepping in something that's causing her to lick. Fertilizer, salt, toxins on the pavement, rough concrete, household cleaners, insects, etc. are all things that can cause irritation and therefore licking. My guess would be an environmental irritant, rather than a systemic allergy.