I'm so sorry your little chicky isn't getting better. My pullet that had similar issues as your chick did improve enough to go outside with her flock, but she still has issues with the one leg. At this point, I don't think it will ever be 100%, but she can walk around, scratch, and get on her roost, so I thought she was better outside. I think she became so dehydrated that she had an electrolyte imbalance and damaged a nerve. My best guess since any other sickness would have killed her or healed by now. She is managing well with her flock, although whenever I'm outside she runs to me to pick her up, she thinks I'm her roo I think! I hope your little one shows some improvement, but I'm concerned after this long that there may be some permanent nerve damage.