Fruit has a huge amount of carbs which go almost straight into the blood – especially orange! How could you suggest that! The GI of an orange is massive. In fact, I never eat them for this reason.
I’d do nuts. Rich in good fats, protein and fibre, but low in carbohydrates. Protein satisfies hunger pangs longer than anything else. Almonds are best. But might be a bit bitter for a child. Macadamias, brazils, walnuts, pecans are all good choices. Avoid peanuts, they are not a good thing to eat, they aren’t really nuts and can contain unpleasant products of a fungus called aflatoxins.
Rice cakes contain almost no carbohydrate – one with almond butter (not peanut butter) on should keep her ok for a while.