Normal range for sugar fasting is 80-120, and 2 hrs after meals is 90-150 for her age. Glucose value less than 70 is considered low sugar and needs to be corrected with a teaspoon of sugar or jaggery or 1/2 cup of juice or 1 piece of chicki or glucose biscuit. Sugar of 79 is on the lower side of normal, and if she is having that level frequently , diabetes medications need to be adjusted