Does she free range? I think it's possible that she's eating something that doesn't agree with her which is causing the problem. And the undigested greens in her droppings would be my #1 suspect.We did try an 18% layer feed last winter (Feather Fixer), but we had more issues with loose poop and decided to go back to the 16% protein and they've done better....except for Marge, who's poop is always the same no matter what we feed her.