Most of the time dogs eat their own feces because they are lacking nutrients in their diet. I would think about switching her food. There are also products you can put on their food so that their poop tastes bad (as if it shouldn't taste bad enough already

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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.