What protein are you feeding her? Has she always had chicken-based food? You might want to try a different protein if you haven't already--some dogs do develop allergies to specific proteins. Our Macie can't eat chicken at all so we have her on a pork-based diet now.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."