Hi @rayaishere, welcome to Connect. Mayo Clinic Connect is a place where you can find people like you, with similar questions and concerns. That being said, I am not a doctor and can't weigh in on the prognosis of your mother's cancer, but I found this story about a woman with peritoneum cancer that has a brief description of her experience and resources for additional information: http://bit.ly/2cUavlK

I'm also tagging @hopeful33250, @bevvigil and @saveunborn who have all written about similar types of cancer in the past and might be able to share their experiences/insights. Has your mother considered a second opinion from a doctor that might be able to walk her through everything a little more clearly?