does she like oatmeal? Not the packet-flavored kind, but plain quick oats w/ some berries thrown in.
I also like to do the high-protein homemade "energy bar". You control the sugar and add-ins, so something won't get too sweet. You can cut 'em in smaller pieces, maybe she just wants a bite or two or keep a ziploc baggie in the backpack to hit a few bites again mid-morning.
I riff off this base:
http://allrecipes.com/Recipe/Playgroup-Granola-BarsI've been cutting the brown sugar completely out and using maple syrup or honey (and less than the recipe requires). You can really do it to taste and then just keep mind of the moisture in the recipe. I use unsweetened applesauce for all the oil, so that helps when I cut the syrup/honey.
I use whole wheat flour and the wheat germ, add in crushed flax seeds, and you can add in protein powder too.
From there - it's the add-ins you want. I like to do sunbutter (I'll cut a little of the applesauce) and chocolate chip, or I'll do unsweetened coconut and cocoa nibs. Another yummy combo is pumpkin (again, cut the applesauce a bit) and craisins and then top with toasted pepitas (inside of pumpkin seed).
Depending how you play with the recipe you'll have to figure out the moisture ratio to get a cakey or crisper/denser bar.
They freeze exceptionally well.