A healthy diet, such as those recommended in the books you mention, will achieve exactly what it is meant to do - give you sustained energy. It may be that your daughter has a sensitivity to certain types of food and that her body's carbohydrate response is exaggerated. The bottom line is that if she feels better on the healthy diet, she should follow that and really make it part of her lifestyle. I don't know what tests she had, so it is difficult to comment. If she has risk factors for diabetes such as overweight, family history, hypertension, abnormal cholesterol, etc., it may be worthwhile to go back to her doctor on an annual basis for screening for diabetes.
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