Hi. My Mother Was Diognised With Breast Cancer Last Year

hi. my mother was diognised with breast cancer last year in august. she was undergoing chemotherapy and early this year she was hospitalised because of septic shock. she stayed in hospital for a month and was discharged after the doctors said they couldnt do anything for her since she had developed brain atrophy. i want to know how long my mom has to live suffering from this disease.