My baby girl was diagnosed with acute lymphocytic leukemia in 2006, and now he is diagnosed w/ aml. Is this possible?

Very sad but.. This is a terrible situation. Unfortunately sometimes the treatment for acute lymphocytic leukemia can lead to damage of the normal bone marrow cells and lead to a secondary AML (acute myeloid leukemia). It sounds like that may have happened in this case. So sorry to hear this.
Yes, unfortunately. How horrible. Unfortunately, one of the late effects of the treatment for all is secondary leuekemias. This is rare, but it does happen. The work-up will be similar to when she had aml. But the treatment is quite different. Good luck to you all.