A 58-year-old woman from urban Delhi attends a community screening camp organized under NPCDCS. Fasting blood glucose is 128 mg/dL, and HbA1c is 6.8%. She is overweight (BMI 27.2 kg/m²), has a waist circumference of 92 cm, and reports no prior diabetes diagnosis. Her mother had type 2 diabetes. On examination, she is asymptomatic with no signs of diabetic complications. According to NPCDCS guidelines for diabetes prevention and management, what is the most appropriate intervention at this stage?