Oreo’s leg surgery

Oreo is a 4 year old domestic shorthair. She ran outside and injured her front left leg. We are thinking she got it caught in a folding chair. She had a huge gash and broke her ulna which is preventing her from putting weight on her leg. She needs extensive surgery to repair the bone and joint. They gave us the option to amputate the leg, but she has severe vertigo and amputation would be a death sentence for her. Please help my fur baby so she can live the best life possible!!!!