Yes, I just said I wouldn't rush to judge her.
Some kids grow up in a total absence of adult supervision and don't develop properly, intellectually or emotionally.
As a 15 year old, she's a victim of statutory rape as well, and I guess the police and the courts will determine how culpable she is in the crimes against her sister.
According to the article, the 15 year old was turning tricks for money, and in fact was arrested at the party while turning tricks.
One of her parents told the police that they had had trouble with her before