I was going to suggest food allergy but since you have already cut out a lot, it's hard to say. It could be seasonal allergies. Or perhaps she's allergic or sensitive to something in the grass. We always rinse their paws and butts after going outside. It could also be a nervous tick.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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