I have a 4 to 5 week old chicken that I saved 9 days ago because the mother hen wasn't taking care of it. It was slow and had gimpy feet and legs. She falls over very easily and if you picked her up and them put her back down the toes would curl up and she would face plant. She had been getting better and was eating and it seemed like her legs were getting stronger, the feet still curled but not to bad. She was doing very good yesterday morning but when I got home at about 3:30 she can't walk, can't stand, she won't eat, won't drink, and just lays. Her feet has got so bad that she can't keep her toes strait and her legs are so bad that she can't keep them under her and she just goes straddle leged. What is wrong with her and what can I do to save her if it's at all possible?