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Your mother is having Hypertension
long standing( Duration of disease) can cause renal failure
and when kidney fail there is Anemia because of hormone deficiency
That is why she requires Procrit is to be given to treat Anemia, This is good drug to treat anemia due to kidney failure other wise you need to give blood .
We should keep her blood pressure controlled by medications and also keep her blood sugar also with in desirable range.
Kidney failure may not be reversible but can always slow it's progression and prepare for Hemodialysis
in case kidney failure worsens.
Take care of diet fluid restriction,low protein,low Potassium diet as advised by your doctor.
Take care of her.