Be sure to monitor her weight and height to be sure she is getting the calories she needs. Forty to forty-five percent of an adults skeleton is built during the teen years. Your daughter should be getting 1200 milligrams of calcium each day. That's equal to four glasses of milk or the equivalent. Substitute yogurt, cheese or calcium fortified juices and cereals if milk is not preferred.
Teen girls tend to be deficient in folate.
It is a B vitamin needed for cell division. Folate is high in dark green leafy vegetables, seeds, beans, and orange juice. From a tactical standpoint, it is best not to pay much attention to the pickiness. Many preteens are very finicky eaters. Encourage eating a variety of foods, but don't make an issue out of it.