My Mom Has Been Diagnosed With ALL In August (we

My mom has been diagnosed with ALL in August (we got her a bone marrow biopsy) her blood film was detecting 65% blasts. She didn't take any treatments but cortisone since then, now her CBC is all in normal range. Her white blood count is 7, though it was 52 when we first checked her CBC. & the blasts went from 65% to 20%.
Philadelphia chromosome gene was negative. & I'd like to add that she don't have any physical symptoms. Is it possible that she had a leukemiod reaction?