teen depression

My granddaughter is 13 & had diabetes since she was 2.  Her parents have never manged to keep her blood sugar under control, mainly through lack of discipline, and over the years there has been a history of many highs and lows in blood sugar levels.  All her grandparents are very concerned for her health.  I do not live near them and only get to see them once in a while but over the last couple of years I have become deeply concerned.  My granddaughter is showing serious signs of depression which everyone is mistaking for "the age" she is.  My main concern is that now she refuses to eat very much.  Her carbs are mostly high sugar content, very little protein mostly cheese, and no vegetables or fruits or whole grains to speak of.  To me she is starving to get attention, literally.  
She had a hypoglycemic episode while I was in their home this past weekend; she woke at 4 am with much confusion passed out and her blood sugar was extremely low (I didn't find out the number).  After administering glucogin they wanted to send her off to school!  
Apparently she has had at least 3 more such episodes in the past month.
I encouraged them later in the day to call their doctor and get a referral to a child psychologist because this is just too big a problem now to ignore.  
About six weeks ago I attended one of their appointments with her dietitian and was told that diabetics are not to be treated differently any longer and that the hope is that they would "choose" the right foods.  I was appalled.  My daughter seems unaware of all of the education she has had regarding nutrition and seems unwilling to get help regarding same.    
It seems I am turning into a nagging grandma and yet I feel I have to; I am so concerned for my granddaughter.  Am I on the right track and if not what kind of things would be helpful?

[Grandmother1946]

The teen years are a hard time to be "different".  Yes, she needs counseling.  She also needs to be taught that she is the one responsible for her health.  All teens go thru rebellious phases.  She needs to understand that in her case it could be deadly.  She is not alone. There are a lot of us out here!  Is her doctor a specialist??  a GP?  a Pediatrician?  She needs a doctor who specializes in diabetes.  If you can find one who also specializes in teenagers, that would be even better.  Tell your daughter that a 15 year old is still a child.  If the mother/father doesn't learn the foods to encourage and how much she should be eating,  they are contributing to their daughters bad health. Parents and child together should attend education classes.  The education will probably not do any good until she gets some counseling.  You are one smart Grandma.  Don't give up.