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It depends on her height and how active she is, among other factors. At that age, because she's still growing, it would really be advisable to consult a dietician. In the absence of a professional opinion, try starting her out at 1500 calories per day. Have her step on a scale three times a week, always at the same time of day. She should be allowed to lose no more than 1-2 pounds per week; losing more than that can be unhealthy.

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11y ago

What else can I help you with?