J.T.
She is most likely hitting a growth spurt. As long as she is eating good food and not junk, there should be no reason to worry.
You could add some yogurt to her diet to help with digestion and maybe some whole grains like steel cut oats and brown rice instead of the rolled oats and white rice. Some one suggested higher fat foods, I would concur. Kids this age need the fat for proper brain development. Cook with olive oil or butter (its no bad as most people are led to believe). The whole grains will also add a bit of healthy fat. Eggs are also a good source. You can try those omega 3 eggs.
Kids this age are high energy and need the fuel. SHe may be doing it for attention, but I doubt it.