I am a new Chicken Mama who discovered last night that my smallest of 6 chicks has a very swollen belly and a hard time walking (waddling because her belly is so enlarged). The belly is not hard, and I don't see any signs of crusted poop around her vent. She was eager to let me rub her belly and fell asleep while I was massaging her. She is still drinking water, but I haven't seen her eat. She seems to be cold, as she kept huddling with the others (or maybe she just wants comfort). The coop is plenty warm, but I did move the light down a bit lower for her. What should I do / watch for?