Don’t be discouraged!! Don’t be afraid to ask for a miracle either.
We got my mother miraculous water from Lourdes right after she was diagnosed in early October of last year with pancreatic cancer that had already spread to the liver. She was as yellow as a highlighter pen and weak with liver failure. They gave her an external drain and basically sent her home to die with a hospice nurse scheduled. They did give her the first chemo treatment before she left the hospital and I asked everyone across the country that I could think of for prayers. She began using the miraculous water before leaving the hospital. By the time the lady came to visit (on a Sunday which tells me they thought it was the end), Mom answered the door herself.
She had normal liver function tests by January and no pain (except from a few minor procedures) at any time. The huge mass blocking her pancreas has dissolved.
I know it is not the norm and I am grateful for the miracle of more time that we have been given. A couple of people in my choir have parents who also were supposedly terminal with pancreatic cancer and they have survived for multiple years at this point. The doctors have been baffled, but I know that Our Lady has interceded for people including my mother (who is not even Catholic). I pray that your sister receives a miracle also. You can get the Lourdes water through a site online if you do a search and of course we will all pray, pray and pray some more!!