Hi Jan,
I was diagnosed aged 11. a long time ago. School days were tricky back then. Sense of denial was an obvious rebellious teenage tactic. I employed it to a point, but it very quickly became self defeating. I wised up after a year or so and learned to recognise my own body. I'm 54 now and don't need a meter to tell me when I'm high or low. It's not pleasant to be at either end of the spectrum so I deal with it for my own well being. That said, I test more regularly now as the tech has moved on and made it easier. I've never got close to a pump and I still don't even qualify for a Libre meter.
Hba1c was 53 at last check up.
I was embarrassed about my diabetes for quite a while, but not anymore.
Play with the hand you are dealt, eat well and live your best life.
Your daughter will be fine.....