M.R.
Make sure the breakfast has protein, complex carbohydrates, and fats (the good kinds, of course). The proteins will help keep her feeling fuller longer and the complex carbs will provide her energy but not energy that is gone in 30 minutes. The complex carbs will be released more slowly thus creating a steady stream. Also, can she pack snacks to eat mid-morning so she doesn't have to wait so long for lunch?
breakfasts:
-whole grain english muffin or toast, topped with peanut butter and a banana (or other fruit)
-greek yogurt (or other if preferred) topped with a little bit of whole grain cereal and fruit like blueberries or raspberries
-Apple slices dipped in peanut butter served with a mozzarella (or other white) cheese stick
-breakfast wrap: whole grain tortilla with yogurt, berries, sliced almonds...or scrambled egg whites, browned ground turkey, and chopped red/green peppers