In order to comment on her energy requirements, I would need to know how tall she is. The Healthy Kid Calculator includes age appropriate percentages of fat, carbohydrate and protein. Her carbohydrate appears high and her protein low as well as a slightly low-fat amount. Her calculated protein grams may be higher than her Recommended Dietary Allowance (RDA) because % protein is based on calorie recommendations not RDA. If 65 grams of protein as 15% of total calories = 260 calories, then her basal calorie recommendation should be at least 1,733 Kcal or 7,251 kilojoules. (One calorie = 4.184 kilojoules.) Since her energy estimation you calculated at 8,500 kilojoules is 1,000 kilojoules less than her actual intake, you may have underestimated her activity kilojoules.
Consider this. The only variables are food intake, energy expenditure and physiological stress (fever, burns, surgery, broken bones, etc.) in addition to growth. So, if she is healthy and without physiological stress, either she overestimated her food intake which is less likely than you underestimated her energy expenditure. Another factor in children of course is growth energy which is difficult to estimate and you could attribute the 1,000 kilojoules to growth if you are sure her food intake and activity expenditure are accurately estimated. Have you read the current (2004) RDA book on calories needed for growth in children?