I have 8 chickens - 9 month old, and one of my Dominique chickens seems sick, she is smaller than the other chickens, her comb seems smaller than the other Dominique and her comb and waddle look pale. My boyfriend thought he felt a lump in her throat but I couldn’t feel it. Non the less I was told a while ago that may mean an impacted crop so I fed her some grit soaked in olive oil. But she doesn’t seem to be getting better. She is eating but she is so much smaller than the others that she feels fragile and is slower than the rest of the girls so I’m worried about predators. Any suggestions?