My Sister In Law 32 Yr Old. She Is 17

My sister in law 32 yr old. She is 17 weeks pregnant and has stage 4 pancreatic cancer and lesions on her liver ,she is at home getting pallative care on two syringe drivers ,she is afraid to ask how long she has left so the rest of us do not know .we need to organise things so therefore we are wondering roughly how long can she last like that .thank you.