Chances of leukemia coming back (child)?

My 7 year old niece has battled leukemia before (age 2-5). She has been fine for the past few years. She became sick yesterday (104 degree fever). And my sister is being told my niece has low blood count and low platelet count, but no apparent sign of infection. She's being moved to the Children's... show more My 7 year old niece has battled leukemia before (age 2-5). She has been fine for the past few years.
She became sick yesterday (104 degree fever). And my sister is being told my niece has low blood count and low platelet count, but no apparent sign of infection.

She's being moved to the Children's hospital right now for further testing.
What are the chances the leukemia is coming back?
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