I'd look at BML or HPW diets for a staple food - but aside from that, the more fruits and veggies she eats the better off she is. Variety means a wider spread of nutrients.
Papaya, watermelon, honeydew, canteloupe, cherries, pears, cucumbers, carrots, peas, fresh corn, sweet potato, and eggs are all favorites for most. Keep up with the chicken and yogurt too. There's no reason not to experiment now - just go with what she likes.