My daughter was same (she threw up 2-3 times a day even at the age of 2 years old), she got better over time. She is 9 now and still closer to transfusion date she complains about low appetitie and sometime nausea. Like I said, children are different than adults, they react in different fashion when HB is low. Lack of energy, low appetitie and body stress closer to transfusion date, this is not uncommon in children. No need to worry, she will get over it over time.