Welcome to HCM,
I can appreciate your concern about your mother, her blood sugar is 140 which is normal ,if we test the blood sugar after eating something it is called Random blood sugar,as this is normal
If you are worried this can be repeated in fasting to know Fasting blood sugar and 2 hour after lunch to know PPBS. At present she is not diabetic please do not worry.
A little bit of stress
is all right bit excess of stress is not good for health.Diabetes
is life style disease also depends on genetic factors and partly on diet and stress.
Please take care