How many carbs does a 11 year old girl need?

600 calories worth, or less for carbs

600 calories worth or less of fats

800 calories worth or less of protein

An active 11 year old should be around 2000 calories with a 30/30/40 ratio of carbs/fats/protein

For a less than active 11 year old or if weight loss is desired, lower calorie counts while maintaining ratio