Don’t know what to say, re-transplant is an option. It depends how desperate you are. Bone Marrow Transplant certainly is an option but is not a perfect cure for most. The reason for imperfection is the Chemotherapy which effects fertility and other organs of the body. The baby has already gone through it one time, not sure what toll her body took with the first transplant. It is a risky procedure and some choose not to go this route (even they have the resources/match available) because of the damage and risk.
In the end, Agreed, it is the only available cure at this moment. Should people refrain from Bone Marrow as other treatments are in the pipeline. The management of Thalassemia has improved so much that patients are living close to normal lives. Should people wait for next five-ten years and hope for gene therapy and other techniques. There are promising trials going on while we speak. This is a debate every parent or patient should have before taking any decision.
It will be interested to see how other members think.