Gurkiran,
At this age, there isn't much you can do to slow down the rate of drop in her hemoglobin. You may begin to notice some paleness in her skin and of her lips if her hemoglobin drops, continue to monitor her activity level and her feeding.
My 14 year old son has thal major, her was diagnosed at age 3 months and he has been transfused since that time. He is a very normal and active 14 year old boy with thalassemia being a very small part of his life. We usually forget that he has thalassemia until transfusion day.
As your daughter grows it will be important to give her a nutritious diet, vitamin supplements and keep her iron levels low. The doctors at Oakland and thalpal can guide you through that. Your daughter will grow up to be a healthy and very normal young lady, and she will live a long healthy life. We are all here to support you along the way.
Best,
Sharmin