Your description suggests that your mother has landed up with early diabetic Nephropathy( DN)
DN is a known complication of long standing uncontrolled diabetes
Goals of treatment are to delay the progression of her Nephropathy
Control her blood pressure
Her diabetes should be managed by injection insulin
now instead of oral anti diabetic drugs.
toxic drugs like gentamicin
etc and avoid pain killers
Prompt control of any urinary tract
Low protein and potassium diet is to be given( reduce milk Dals,citrus fruits,coconut water)
Even if her BP is normal some dose of ACE inhibitors or ANGIOTENSIN
RECEPTOR BLOCKERS should be given.