Hi Hanh,
Has your daughter's hemoglobin and iron been checked recently? I have a little guy 2.5 year old, with thal minor, I give him a liquid vitamin, Poly Vi Sol. I sneak it in his juice, the vitamin does have iron, but he refuses to eat meat at this point, so I think he needs it. Is she eating well? Have you visited with a pediatrician about her symptoms?
Best wishes,
Crissy