Yes separate her from the rest....well, after typing that grab another chick to keep with her so she will not be lonely. A clearview container or tub. pine shavings on the bottom same kinda of set up as you have for the rest. Except no roost. Cries how? you kinda have to judge it. Pick her up and stretch her wing and handle other areas of her body and "not" her injured leg. See if she cries the same. Remember, you can take her to the vet. If that is not an option....well "you" are her only hope for care and nurturing. Just be gentle and "slowly" start the taping. Don't take off the taping at night. Example would be if your leg was broken would you take off your cast at night to see how well it's doing? No, you need to leave it on until it is better so you don't bend it out of wack again. So, with that being said, you need to be diligent and faithful to this chick to get it better so you can sit back later and watch it run around the yard with the other chickens.
Also, the more time and effort you spend now on getting your chick better the less you have to worry about it's future and how it will manage free ranging.
Okay enough of my rambling.
Keep us posted.