Generally speaking, there are at least 2 types of acute leukemia
, with different survival rates.
Having said that, it is a good thing that the count has dropped from 240,000 to "0" white blood cells; though it is more important to ask your Dr. if she is in remission (i.e. if the abnormal cells are no longer present in the marrow).
So, be not alarmed, as regular blood tests are the ways the hematologist
can monitor her ailment.
I wish her speedy recovery.