Abbas,
I am happy she is enjoying her school.
Concerning the ferritin reading, no doubt that there was a wrong test because no way she can have this drop in one month and most probably she is in the 500 range since she is recently transfused as i suppose.
But since she will be starting Asunra (on 500 level of ferritin), please moniter her ferritin so it won't drop than the normal range. Also moniter her liver and kidney functions every month
Good luck and keep updating
manal