What is the life span of end stage renal disease with one kidney dead other less than 10% no dialysis/transpnt

also the person has diabetes, skin cancer, cancer, shingles, is on methadone, and 20 other pills from blood pressure, capapril? pacsil, and many others, also was on perocet, fentenal, now on methodone, doctors gave her 5 years to live from cancer going on 11 yrs. doctors also gave her 2 months to live with refusing treatment for kidneys, been 2 months, she also gets sick a lot, throws up blood sometimes, she is my boyfriend's mother, she refuses home nurses, free care, etc. some web sites say 6 months tops others says many years, how longs before the toxins build up in her system, also she only eats once every three days, refuses food, sick, when she eats its deep fried egg rolls or fried eggs, milk, bread, and she drinks approx. 15-20 cups of instant reg. coffee a day, smokes 5 cartons of ciggs. a month, sometimes she is out of her mind, some days fine, how long is her lifespan? she is 62yr. thanks.