Is leakemia dangerous or can it be healed?

My friend had been diognised with leakemia (blood cancer) and I am super freaked out for her.. she is an amazing human and she doesn't want to take chemotherapy and it's the main thing to take in cancer.. she says let it go through my body.. what life I need and my country is in such.. please helppp... please... does this type of cancer kill? Can a human live a normal 60 year with this disease... can she return to be normal 😢😢😢😢
Is leakemia dangerous or can it be healed?
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