Have you talked to the doctor about trying hydroxyurea? It may be worth it if you want to continue avoiding transfusions, and if a BMT is a possibility, you do want to limit the amount of transfusions she does get, as it introduces new antibodies to the body. It's a bit easier for the BMT to work if foreign antibodies are not in the body. And the dark circles are most likely related to low Hb. I know you're apprehensive about transfusions but if you choose that path, you will be very happy to see how much better she does. Whatever path you choose, her Hb needs to be higher.