Poop eating can be a sign of a nutritional deficiency. However, at the daycare I work at where we also sell holistic food brands, most of the dogs are very nutritionally balanced, and are fed very good foods, and still eat poop. Just in case, what are you feeding?
We literally have to pick up poop the second it hits the ground (and the longest poop piles sit outside are like, 2 minutes, tops. LOL) because dogs *will* eat it as it comes out as gross as it is. There are tablets available in most pet retail stores, the ones we sell would be Potty Mouth and Excel something I think, so I'm unsure about other brands. Keep in mind it will only keep her from eating her own poop, but she'll still help herself to other dogs' truffles.