Just a tip. I metabolize very quickly, and if I drink sports drinks I can notice the difference within a few minutes, sometimes seconds.
Pocari is one of the better mixes, aquarius a close second. the powdered versions including top value are not good.
In the worst case I can drink a few mouthfuls of powdered mix and within seconds break into a sweat. It really goes in the mouth and straight out of my skin, My urine also shows a marked issue in dealing with the ingredients.
I would have an issue giving these drinks to a child undiluted as you may be putting undue stress on the internal organs to metabolize it.
I would suggest trying a 50% dilution with water to see if she likes that, and would not try to exceed 350ml per day.
Also you should see the case of the kids who drunk so much "sunny d" they turned yellow.
BBC News | WALES | Soft drink turned toddler 'yellow'