If she is very overweight/underweight she should see a doctor and nutritionist, she is too young for an 'adult' diet. But if she is normal weight don't worry about her calories, just give her a healthy well balanced diet and her appetite will take care of the rest.
For examples of the daily calorie requirements of a 7-year-old girl or boy, see the page link, further down this page, listed under Related Questions.
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