Her defiance was dangerously foolish in these circumstances, but blaming the victim is wrong. The only blame that adheres here is to the criminals who gunned her down in cold blood.
I don't think anyone is blaming the victim for the crime itself, but they are saying that she had a hand in her own death by showing a lack of common sense. It is a fine distinction, but one worth noting.
"Blame" is too strong a word for the victim; however, she was not smart and could still be alive today if she just shut up. The perp should die for his crime.
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Her defiance is most likely what got her killed. Acknowledging that isn't blaming the victim, especially when it is clear that her response to seeing a gun pointed at her was so obviously exactly the wrong one. She wasn't just an unlucky victim, she contributed to her own death.
It's a lesson that many who read about this sad story should learn.