Help Our Little 4 month old save her leg

Hi everyone, our newest addition to our family, our little Nova, Who is four months old pitbull needs help. I woke up one morning and she can only walk on three legs. Her front left leg was swollen. We took her to a vet and they stated they couldn’t find any bite, so they took an x-ray and said the tissue around the bone was messed up. So they put a soft cast on her leg and told us to come back the following week. I came home Friday and blood was coming out of her cast. We took her to a different emergency room and they removed the cast, and found an open wound and a major infection all the way to the bone. We have been taking her every day for bandage changes and on Sunday night they kept her to see a surgeon. They don’t think they can save her leg we may have to amputate it. The medical bills are very high and little nova needs your help to get the proper care so she can heal and be a normal dog again. The funds will go directly to all the medical bills and a prosthetic leg. Any little help is extremely grateful to us. We just want our nova back at home. She is the most loving dog I have ever had, just the sweetest girl. Shows the best love when u come home from work; which is the best feeling in the world.