four week old chick has a severe injury to one wing and back. Wing seems to be broken with exposed bone end. Featherless area extends from shoulder to back of neck. I have cleaned it and applied Bactine every day. I have her in the house. She eats well, although she is much smaller than her same age sisters. It is staying clean but not healing. Can she survive with the bone end exposed? Should I take her to a vet for amputation of the wing? I don't want to spend a lot of money.