We have a wonderful discussion thread re. vitamins and minerals in thalassemia, please follow the link.
http://www.thalassemiapatientsandfriends.com/index.php?topic=118.0Don't be scared with respect to MRI, it is a painless procedure, however given the age of your daughter its hard for her to stay still during the procedure so I am thinking doctors may put her to sleep during the procedure. MRI machines simply scans and count the iron level in liver using electromagnetic rays (completely painless), the whole experience is like lying on the bed and watching movies.
Your daughter ferritin is high so she needs to start iron therapy, you mentioned oral iron therapy so that is easy to administer. Keep yourself together and plow through the difficulties.
The whole group is here to help so don't be afraid to ask questions.