Help candy on her cancer journey

About 4 years ago my sister was diagnosed with renal cell sarcoma its a type of cancer that is very rare usually found in children and spreads very fast. The cells for this type of cancer are jelly like and can spread easily. These past four years have been the hardest for our family in everytype of way possible yet my sister is a fighter and she has someone she's fighting for her 6 year daughter. My parents have had to stop working on occasions to take care of both of them full time this has taken a toll on all of us emotionally mentally and physically. Her insurance cover what they want to cover and the cost for medications and other things come out of pocket. Im reaching out because we need help shes not ready to give up  and the last we can give up hope. Any help and prayer is appreciated. Please and thank you