I have a 5 week old chick with a hurt foot/ankle. I am not sure what is wrong, but she is having trouble bearing weight on it, swollen joint area above foot. I had moved them to the barn the day before, checked them in the morning, went out at noon and found her on her side under the nest boxes with some blood on her foot. 3 walls are wood, and one is 1/2" hardware cloth, so I have no clue what she did, or got caught in. I brought her inside, cleaned her up and isolated her in a brooder. Each day, she is showing improvement and I am hopeful that she will recover. She is now trying to stand on it, slowly. I think that rest is key and you probably should separate your chick to give it the time it needs to heal, that would give it the best shot. I am sure, my chick would not have made it out with all the others, too hard to get to the food, etc. Good Luck, hope she heals!