failure is of two types acute and chronic. If the diagnosis is chronic in your case then dialsis is must if patient cannot be managed by medicines. in some types of kidney disease patient realizes that he/she has the disease only in the advanced stage when serum creatinine
is very high also urine output may remain ok in some diseases. it is not uncommon. if your doctor has decided she needs dialysis
then it should be done 2 to 3 times per week. if she improves she will not need dialysis but there is no role of once a week or once a month dialysis.
hope she gets well.