She is very difficult to control. He said that she might suffer some brain damage. She has never been so hypoglycemic that she lost consciousness or required professional treatment. I can find nothing in Medline to document the concern of HbA1c being too low. Furthermore, it seems that hypoglycemic events are not related to HbA1c.
Treatment involves eliminating wheat protein.
Your second question about the risks and advantages of meticulous control at this age is a difficult one to resolve as it involves finding a balance between two important but conflicting objectives. On the one hand there is evidence that even quite a modest degree of hypoglycemia, whatever the cause, may lead to developmental delay. If you search in PubMed under 'Hypoglycemia and developmental delay' you will find a number of texts and if you then have access to a medical library I would suggest looking at Lucas, A. et al. in the British Medical Journal Volume 297, page 1304, Nov 19th 1988, and in Jacobs, DG in the Journal of Pediatric Surgery Volume 21, page 1184, 1986. At three years old, the risk is beginning to lessen as a toddler can increasingly express the sensations of hypoglycemia. At the opposite side of the argument is the evidence that meticulous control from the very beginning diminishes the chances of long term complications even in childhood.