I have a 6 week old lavender Ameraucana chick who is haveing problems right now. She seemed fine until yesterday. I bought her from a reputable breeder at one week old. She has been in my brooder ever since with four brothers and sisters from the same hatch. My brooder is inside the house. She started having a hard time walking and her one leg was just dragging behind her. She is still eating some and still drinking some. I separated her and put her in a shallow box. She just lays there. What could be the problem? She seems skinny. She had a bowel movement and it looked normal to me. Pictures below. What is my best action? How should I treat and should I treat my other birds for anything? .