Hi in view of your mother's age,best form of dialysis
would be CAPD.
It is very safe,convinient,can be done at home by the patient/attendant.
In this type of dialysis fluid is instilled into the abdomen through a pipe attached permanently to it.
You can get in touch with a Nephrologist
in person to learn more about it in details.I am of the opinion that if dialysis has been thought of then she will definitely get benefitted by this .
Best of luck