One of my 3 week old black sex links started limping. Not sure what happened? She was fine one day then the next just doesn’t want to put weight on one leg. She eats, drinks preens and chirps but mainly just lays down. I isolated her from the other chicks by putting up a 1/4” mesh wire so she could still see the others. She was constantly being disturbed by the others. Will she heal ? Should I put her out of misery?