Hi Matt,
i am far older than 5 alas, and well done for getting your daughter to do her own blood tests, you must be really proud of her!
For me, ability to unction is not always related to BG reading. During the day, I can fell a bit low, do a reading and find I am in the one point something, but at night, I seem to lose teh ability to function at a much higher level...around 3.2. For me, it seems to be the combination of sleep and BG level that has an impact.
To be honest, it sound like adjusting her carb ration sounds like the right thing to do...she dhouldn't be that low routinely.
As a Mum of 2 children under 4, I am really impressed by your little girl, and her maturity to do these tests. I agree that it would be a good idea to get an adult to keep an eye on things, but to me, putting her "in charge" of her diabetes at a young age, with the right fuidance is a greatthing to do.