Most patients on dialysis do quite well if they manage all aspects of their health as directed. Life expectancy would be more a function of the reason for dialysis.
People on dialysis if following all of their doctors orders and attending dialysis as scheduled could live a normal expectancy of 4 years and others on record of 25 years but as with anyone other medical factors play a role.
This depends primarily on conditions she has associated with dialysis, such as diabetes or heart problems. Some people have lived for more than 30 years on dialysis.
It varies. I know someone who's been doing it for 9 years. Depends on why they are having it, their health otherwise and how well they take care of themselves.
It depends on the person and their overall health. Some live a full life on dialysis. Just make sure she attends all of her appointments and eats a proper diet.