Prayers, thoughts, whatever....?

A good friend of mine, Sarah, is going through a really tough time. Her sister was diagnosed with ALL which is a type of cancer. She's been in the hospital since she was diagnosed, and she's had 3 surgeries and chemotherapy. She's 8 months old. My friend got news from the doctor today, and he said that she doesn't have much longer, and that he can't administer anymore chemo or do another surgery because she's too weak, so he doesn't know if she'll make it. My friend is only 17, and she's been raising her sister since she was born. She doesn't have any other family, so when her sister is gone she said she'll have nothing to live for. If you could keep Madelyn and Sarah in your prayers that would be great. She really needs it. Thanks :)