One of my chicks looks very sick. She is around one and a half months old. She is standing still in one location with her eyes closed and her head burrower in her feathers. She is much smaller than the other chicks and she is not eating or drinking as well. She has been like this for 3 days. She did eat a tiny snake, the smallest snake in the world. I am not sure what is the cause or how I can treat her sickness