Personally, I feed different foods on an almost daily basis to help prevent "boredom" , so you might try that. Although, she might also just not be hungry. Most dogs will take a "treat" even if they're not hungry, simply because it's a treat. Our Isabella will take a treat and growl and whine at it because she's full but didn't want to "pass" up a treat. Blaise will eat treats 'til he vomits (the puppysitter found this out the hard way) but won't do that with meals. So maybe try cutting back or switching foods up.