My baby chick is three days old. It has been lethargic and pooping basically water ever since we bought her (from a farm, not online.) She is half the size of the rest of the chicks we had gotten that day. They are all alert and doing very well, but she is constantly sleeping, losing her balance, and not eating. I suspected that she may have sour crop, since her crop was swollen and felt like a water balloon, so I treated her with olive oil, water, probiotic yogurt, and boiled egg yolk. She seemed to be fine after, and started pooping more solids, but she is still very lethargic and stumbling around. She is also refusing to eat. Maybe she is a runt, I'm not sure. I have been laying off of the chick feed since the sour crop and giving her egg yolk and water mixed with probiotic yogurt. What can I do to strengthen her? And if she is a runt, how do I care for her?
(I have separated her from the rest of the chicks because they were pecking at her)