I recently got 3 day old chicks and it is now 1 week later and one of the chicks leg is injured. when we received the chicks thru the mail in a box she came out this way. she is unable to walk on her one leg, i am unable to tell if it is broken. she seems to fall onto her side and uses her wings to move around. the other chicks are bigger than her although she is eating and drinking. Any advice?