I have a granddaughter that is a diabetic - she is 5 years old--and was just diagnosed last December so I am still learning, but I do know that on several occasions she didn't eat her breakfast, and would be jumping and playing one minute, and the very next, she would be passed out, and we would have to shove cake icing or honey in her mouth--
Luckily, she "came to" after that, but what would have happened if we weren't there to put the honey or cake icing in her mouth?
Her uncle was 23, and had the flu, couldn't keep any food down, and died in the middle of the night.
That age is tough! I was diagnosed when I was five, like your granddaughter. The hardest part for little kids is not being able to recognize the warning signs. I had a number of incidents like the one you describe when I was much younger. I ran a support group a few years back for the parents of kids with diabetes, just providing info to help them through the rough spots, so I know how tough it can be. Your granddaughter is lucky to have such attentive grandparents looking after her!
I forgot to say that her uncle had type 1 diabetes that he got when HE was 5 years old---he just died a few years ago, so that makes us double careful with her--
We keep a glucagon injection with us at all time, so far the cake icing has brought her around..