Hi Durel,
Absolutely no iron. Intermedias will usually absorb more iron from food than needed and as they age, they may need iron chelation even if they have not transfused. Iron is to be avoided.
I think you should get occasional hemoglobin tests even if growth and activity seem normal. This is important both to see if transfusions are ever required, but also to establish a record of what is normal for your doctor. This can actually work to help avoid unnecessary transfusions.
You can give regular unfortified cereals. Avoid any foods with added iron.
Yes, there is a good possibility that she will never need transfusion. Her Hb level will always be low, but may stay out of the range where blood is needed.
I would also strongly encourage that she take multivitamins without iron daily and that she takes folic acid every day of her life. We talk much about diet and nutrition here, so please check this out, as nutrition can play a big role in thalassemia, especially when trying to keep the HB up high enough to avoid transfusions. You should also be aware that Hb does drop during illness, so try not to be alarmed or let doctors alarm you if there is a temporary drop in Hb after an illness. If the Hb stays above 7, transfusions can usually be avoided.