I don’t have an answer for you but I sincerely believe that the body needs what the body needs. A fingerstick will likely reveal whether insulin, both basal and bolus, are sufficient. If your blood sugar is consistently too high, you need more insulin.
If your daughter has gained weight since starting insulin 11 years ago, this may be a part of this problem. If she is 20 pounds or more over-weight she may have become resistant to her insulin. While this is not the defining characteristic of T1D, it can happen. Luckily, insulin sensitivity can be restored.
I’ve lived with an 8.5% A1c and I did not feel well. Cognitive work like academic endeavors is more difficult with high blood sugar.
The best thing would be for your daughter to educate herself about how she needs to take care of her body with respect to blood glucose. Learning what’s required could enable her to make her own decisions about how to treat her diabetes day to day. Diabetes, as you well know, is a 24/7 affair and even the most dedicated doctor in the world cannot be at your beck and call that often. So she realistically needs to step up her game and be her own agent.
Diabetes demands many decisions every day. If you decide not to pay attention, then that’s a decision. And that choice has a high risk of proceeding down a slippery slope with a string of secondary complication diagnoses. It is the secondary complications that are the real threat of diabetes, any type.
If she’s interested in gaining the skills needed to run her own show, I recommend Scheiner’s Think Like a Pancreas and Ponder’s Sugar Surfing. An even better book for her current state of mind might be Eichten’s The Book of Better, Life with Diabetes Can’t Be Perfect, Make it Better.
Finally, if your daughter has gained an extra 20 pounds or so and would like to improve how she feels, I recommend adopting a low carb, high fat diet. It’s a way of eating where you eat until you’re satisfied, there are no calorie limts, just carb limits. Many of us here use this way of eating to good effect. Good luck. I hope your daughter is open to changing her path. As humans we much prefer the devil we know to the devil we don’t. We don’t like to change, especially changing our eating habits.
Please report back if you need any further info or help.