Hi
When I was your daughter's age I went through a similar thing. I still struggle with it now, although I'm much more in control ( I'm 38 )
Had a rough ride leaving home at 16 and I just didn't really care about my diabetes. ( I always took my insulin but I went days without checking my glucose or paying any heed to symptoms of being high etc )
I spent many many years sleeping for long periods. Often I would only really get up to use the bathroom, get some water and take some insulin.
For me I believe it was a mix of running very high all the time and depression. I have also now been diagnosed with chronic fatigue syndrome but I feel that the depression played the biggest part.
Complications starter to appear in my 20s which just made me more depressed.
I hit my 30s and realised something had to change. It wasn't an easy path. At the time I was in a bad relationship but I slowly managed to take control and start caring about my diabetes more. Went on the carb counting course, built better relationships with my diabetes clinic... And got therapy!
Last year I moved into a bungalow in a lovely quiet area ( there was a lot of drug use and violence where I lived before and my ex was still hanging around. For the first time in over 20 years I open my curtains!
Yes, I still have times when I struggle. The complications play havoc with most things ( hindsight hey) but I feel so much.... Lighter?
I still take a nap most days but I allow myself only a couple of hours at most, unless I'm poorly.
As someone said above. Could you view your daughter's Dexcom via the follow app if she would be open to it.
Keep talking to her. Be there for her, even if she thinks she does not need it. My parents did take a step back and let me ' get on with it ' , because I had no interest in good advice back then but they were always ' there ' .
Wishing your daughter and yourself all the best.