Our Buttercup is a 3 yr old Buff Orpington. We noticed yesterday that she was just sitting in the coop and while the other girls were outside eating. We brought her in and looked her over...I can't find any actual "injury" but she can only walk a couple steps and then she sits again...it appears that her balance is off or she is lame on the one side. It's almost as if her one leg/foot is weak. Her comb is bright and she's talking some but just can not get around at all. She did eat a little but just isn't herself and I have no idea what to do. I have her in the garage in a small pen... What should I do??