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A 15-year-old girl is brought to a regional emergency department by her mother after fainting at school. Over five months she has cut all fats from her diet and now eats one small meal a day. She is 163 cm tall and weighs 45 kg and is alert and cooperative. Supine heart rate is 46 beats per minute; supine blood pressure is 96/58 mmHg, falling to 62/40 mmHg on standing. Tympanic temperature is 36.2 degrees Celsius, and electrolytes and electrocardiogram are normal. Her mother is willing to supervise all meals at home. Which one of the following is the most appropriate disposition?
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