Thank you for your question on your mum. First the units you are using are very important I assume you are using mg/dl which indicates that it s very low. most people have a problem of high blod sugar level. but your mum has now sugar level To assist let s get the basic principles Blood sugar is due to good we eat which is converted into glucose This glucose give use energy when pushed out of blood stream by hormone called insulin from pancreas. Now when you have low blood sugar may mean two things. First. not taking enough food to give you sugar second. May have you much insulin pushing your glucose into muscles Third. Abnormality in starch to glucose metabolism Investigations Close follow up of glucose level in blood before eating and after eating insulin levels in the body Consult endocrinologist