Help save my sisters life

My sister is the mother of 3 precious little girls. Last week on Wednesday she was feeling funny as her words began to slur. At that moment she new something was wrong. My Mother thankfully was present to notice and immediately called 911. That night my sister had 3 strokes, 2 before she got to the hospital and 1 at the hospital. My sister has been diognosed with a rare disease named MoyaMoya disease. The only way to handle this is brain surgery. This disease causes narrowing of the vesals in the brain causing serious complications. She has vessels that are completely closed. The only reason she is alive are because of collateral vessels. After this was discovered they have now noticed she has an issue with her heart. The Mitral valve has severe regurgitation. This is something they say they have never seen in a 37 year old. This will and can only be corrected by open heart surgery. Brain surgery and open heart surgery is pretty scary. The problem and why I’m seeking some help is she has no health insurance. The hospital said this will create a problem. Anything helps at this point. My family and I are getting together to put as much as possible towards this nightmare that has come before my sister.