It is not uncommon that hypo-glycemia can preceed
diabetes in some people. Hypo-glycemia is a condition
in itself, as well, and when you look for a second opinion, seek out the advice of a pediatric endocrinologist. These folks specialize in the endocrine system, and will be very familiar with both hypoglycemia & diabetes.
WAK is 100% right in encouraging you to trust your knowledge of your daughter and to be a relentless advocate for her.