Is Porphine Pump Ideal, In Case Of Stomach Cancer, For Pain?

Hi, my gran is 78 years old was diagnosed with stomach cancer 6years ago it has progressed to her lung and pancreas over the years she refused treatment and has lived for this amount of time over the last 6months to a year she has lost considerable amount of weight she isn't really eating and has a small drink of water periodically she constantly picks up infections and I know her immune system will be low, she recently got a urine infection and was given antibiotics but she has been in a lot of pain and her doctor got her a morphine pump which she will be on daily at home she's completley housebound now and is mostly in her bed, I was thinking maybe this is due to her cancer and don't really want to ask my mum as she is too upset, her doctor said she is going down hill could you please tell me rufly how long she has left it is horrible to see her like that and in so much pain and I don't want to upset my mum anymore by asking her what her doctor thinks. Thank you