Dear sir i can understand your concerns in my opinion this kind of repeated low sugars need to be evaluated for conditions like increased insulin secretion from pancreas or any other source. usually blood sugar going below 50mg/dl is very dangerous to brain as 90% of brain depends on glucose for daily energy needs. Low blood sugars also affect heart rate to become irregular.which will give feeling of tiredness kindly do blood test like fasting insulin essay and C-peptide essay this investigations might guide us towards diagnosis. kindly give her short meals with complex carbohydrates. meet endocrinologist regards Dr vamsi krishna Diabetologist Apollo