Hi! Is your Dr suggesting she get rid of all carbs? Because carbs are essential for proper absorption of protein, especially in growing children. Many people who followed the Atkin's diet lost tons of weight, but felt terrible and gained it all back once they started eating carbs again. She can eats plenty of fruits and veggies, meats, eggs... Give her carbs, but just watch it, I can probably eat 5 breadsticks b/c I LOVE bread, but that isn't healthy at all, so limit it to one serving, and with something healthy like salad and grilled chicken. For example, a baked potato with a small amount of Smart Balance butter, salt, pepper and low fat shredded cheese is way healthier than one loaded down with sour cream, tons of cheese and chilli.
For dairy, here are dairy substitutes out there that she may be able to eat.
Make sure she eats a well rounded meals and portion control! An actual size of steak a person should be eating for *one* serving should be the size of a deck of cards. But now a days, with how we eat, it's more like 4 servings of beef.
Some keep the portion control have her remain active, drink lots of water, 32 oz a day if possible and eat well rounded and healthy meals.
So that she doesn't overeat or feel limited by portions at mealtimes, she can have healthy snacks throughout the day. It's actually healthier for our bodies to have 5 small meals, than 3 larger meals. She can have apples or celery with peanut butter and raisins, quesadilla with black beans and cheese, handful of nuts (almonds, pistachios, cashews, pecans, the yummy kinds), avocado sprinkled with a little bit of salt and lemon juice, pretzels, fruit, carrot sticks, rice cakes with almond butter or nutella.