Hell, When a person gets diabetes, it is observed that almost 50% of his or her Insulin producing cells of pancreas (Beta cells) tend to be non functional. Further, if blood glucose is not rapidly controlled, then glucotoxicity due to hyperglycemia (high glucose in blood) further damages beta cells. Therefore, after few years suffering with diabetes almost every single patient has to start taking insulin as most of the cells are non functional. There is no insulin in the system. It has to be given on daily basis for controlling blood glucose, that too for lifetime. Looking at the blood glucose levels mentioned, your mother has to be on Insulin injections along with oral anti-diabetic drugs, if necessary control has to be achieved. There is no other option. If the glucose level is not controlled effectively, the long term serious consequences of diabetes will start manifesting like retinal problems, peripheral neuropathy, affection of blood supply to the lower limbs, cardiovascular diseases and kidney disease. Ideally if one has to achieve good control then fasting glucose should be closer to 100 mg, PP 160 to 170 mg & HbA1c%Along with Insulin and other drugs, she has to take a restricted diet, avoid sweets completely, also deep fried foods, pastries, bakery items and sweetened aerated drinks (colas). Should consume more of green leafy vegetables, salads and use whole grain flour for chapati and roti. Plus exercise daily for at least 1 hour and maintain near normal weight. Sugar levels will come down with proper type of insulin and dosage adjustment plus oral drugs. Thanks