Hello. I'm not a medical professional, just the parent of a kid with diabetes. As a fasting blood glucose result, 80 is on the low end of the ok range, but it is in the ok range.
If your daughter will develop diabetes, or just hypoglycemia, there is nothing known that you can do to prevent it. You can keep your family, daughter included, more healthy through exercise and a better diet with more fruits and grains, for example, but that won't stop hypoglycemia in your daughter.