Had fracture in Left leg ankle now wound

Hello doctor, my mother aged 52years had Fracture in left leg ankle 3 years ago. Now doctor after 3 years doctor is telling that fracture has not gone completely for which u can do some exercises like that. Now 8 months back she had itching and small injury due to scratching due to which it turned into septic and doctor started removing septic and dressing making big hole in that area. Now after X-ray, scanning and all doctors are saying there is blood clot due to which there is no blood flow in that area due to that all this is happening like that. Doctor says she Have to undergo laser treatment and all. First doctor had said for plastic surgery but not it's Not suitable to go for plastic surgery doctor says.We are worried. Kindly suggest what to do? It's now open wound about 3inches for which daily dressing is required. Doctor says it's something related to vascular veins. Blood circulation blocked and all. Please suggest what steps to take