Your mother should try to control her blood sugar levels by diet control and daily walk.
If she is overweight
,then she can be put on a insulin
sensitizers drug called as METFORMIN
500 mg twice a day.She should be monitored regularly for her diabetic status.
You can discuss with your doctor regarding the drug I mentioned above.
Make it a point that her BP and diabetes
should be meticulously controlled.
Don't forget about the control of her uric acid which is equally important.