Pmeet,
Dr. Neufeld always told us to never worry about Iron in food for my Thal major daughter. A growing child's body needs Iron, even a Thal major child. And iron from food is negligible compared to the blood they get. So, every type of food can be eaten in moderation, including iron rich food. Only thing to remember, when the chelation starts (after 2 yrs of age if regularly transfused and ferritin is above 1000), make sure you are dilligent about giving the chelation medication to her. There should be no restriction on food, if no allergies - not for mom, also not for the child.
p.s. though I must say, I stayed away from Iron fortified cereals and we eat red meat only occasionally.