The symptoms DO sound very typical of hypoglycemia. I have known people who are not diagnosed with any kind of illness, but who can get so severely hypoglycemic that they can pass out completely for a short period of time. One of my high school friends does this often enough that her co-workers keep orange juice in a frig at her place of work in order to rescue her if they see her looking dazed. I agree that the best thing to do is to get a glucometer and test her when this happens.
Hello. I'm not a medical professional, just the parent of a kid with diabetes. Hypoglycemia may not always show up on a blood test. You need to test while she is having those symptoms, which means that you need to have a glucose meter on hand. When she starts having those symptoms, start testing. Have fast acting glucose available as well, and test how she responds to that glucose. The best type of fast acting glucose are glucose tablets, you can get them at Walgreens stores, as well as most pharmacies. Good luck.