K.T.
Had the same problem and did research. There are two types of iron: Heme and Non-heme irons. Heme irons are more readily absorbed. Examples: beef, shrimp, turkey, clams, mussels, oysters and assorted livers. Non-heme sources can be enhanced when a heme iron or a helper is consumed in the same meal. Non-heme examples: beans, baked potato with skin, enriched breakfast cereals, pumpkin seeds and canned asparagus. Some of the helpers are orange juice, cantalope, strawberries, broccoli, tomato or tomato juice and red or green peppers. Just mix and match to your daughter's tastes and try tricks if she gets picky like making your own spreads with a mix of things she will and won't eat to go on her favorite crackers, bread or even home made pizza. Sneak what you have to and she'll be healthier in no time. As far as red meat and dairy...never heard or read that one. The absorption inhibitors were coffee, tea, spinach, chard, sweet potato, whole grains, bran and soy products. No mention of dairy. Maybe that is digestion related advice to keep her from getting constipated. That can be solved by adding juice. Good luck.
K.