Poor little girl. Look for low-GI ingredients (see link below), choose whole meal and whole grain over refined white flour. At her age (at any age?) I would prefer to avoid artificial sweeteners. Is she allowed fruit? Very ripe bananas and dates are naturally so sweet you may not need to add any sugar. Here is a recipe for banana bread:

100ml light olive oil

100g sugar (halve or even omit it if your bananas are very ripe)

1 egg

zest of one lemon and one orange

4 medium bananas, peeled and mashed

Mix together all the wet ingredients.

In separate bowl sift together

225 g wholemeal flour

2 level tsp baking powder

Mix lightly into wet ingredients along with

60g walnuts, roughly chopped (optional).

Pour into a well-greased loaf tin or silicone tin, bake in preheated 180 oC (350 oF) oven for c 50 -55'. Leave in cake tin for 10' before turning out onto a rack to cool.

http://www.glycemicindex.com/

http://www.mendosa.com/gilists.htm