I bought 18 freedom ranger chicks at tractor supply yesterday. They were all fine yesterday, now tonight I have one that won't stand up. Her leg is stiff. It's slightly red and a little swollen. I tried stretching it out behind her and massaging it but it didn't help. She's also not eating or drinking. I have her in a separate brooder that she's sharing with my silky with pasty butt. It's just the two of them now. She's not moving. When I set her down she fell over and struggled to get back up. What can I do? I'll include some pictures.