Below is an example of a healthy 5,000kcal day, taken from a typical bodybuilding site (where eating 5,000kcal per day is considered a weight gain challenge for moderately active adult males looking to gain muscle mass!).
http://www.gobuilders.com/sports/sportsMed/releases/5000_gain_weight
Try to imagine a rail 100lb female athlete EVER eating anywhere near this much in a single day. The simple ingestion, never mind the metabolization, would actually cut into training time!
Breakfast: 2.5 cups of Raisin Bran with 1 cup 2% Milk, 1 Banana, 2 cups of Orange Juice, 1 cup Chocolate Milk
Morning Snack: 1 Bagel with 2 tablespoons Peanut Butter, 2 cups 2% Milk
Lunch: ¼ pound Cheeseburger on Whole Wheat Bun with Lettuce and Tomato, Veggie Salad with Sunflower Seeds, Dried Berries, and Reduced Fat Dressing, 2 cups of 2% Milk
Afternoon Snack: 1 cup of Cottage Cheese, 1 cup of Applesauce, 1 cup of Fruit Juice, 2 full-size Graham Crackers
Dinner: 2 cups of pasta, 1 cup Marinara Sauce, 6-ounce Chicken Breast, 1 cup Green Beans, 1 cup 2% Milk, 1 cup Ice Cream with Chocolate Syrup
Late-Night Snack: 20 Pretzels, ½ cup of Grapes, 1 cup 2% Milk