she was driven over and set a light at 3 months. rescued. leg attached itself semi out of hip and skew close to spine. vet could not amputate. she runs on all fours. but now callus has formed on side of hip. the surface is raw and her skins lacks elacicity due to 30 percent skin burnt away on side of hip and above tail..what can i do to close callus. and make skin soft and strech