Help. 1 of our 2 chickens is sick. Eggs over the past week are odd colour and shape. Last egg was 3 days ago. The Last 48hrs she's been lethargic, just sitting down all day in 1 place and breathing heavily with eyes half closed. Comb looks nice and red, feathers look glossy and she's been preening and puffing them out. It's spring here and we've had 2 sunny days. What might be wrong and what should I do?