I also feel for the family, but.
Part of properly raising a daughter is instilling them with caution and "discrimination".
Discrimination is the judgment necessary to tell fast from slow, hot from cold, right from wrong, safe from dangerous, and all the other skills that people must develop to make their way in this world.
Bad things can happen anywhere. Sometimes when you try to protect your children from all the negatives in the world, you set them up for a tragedy.
What the heck is a 12 year old girl doing describing anything as sexy? It makes me wonder what sort of exposure to inappropriate peer groups she had. Also there is no way a 12 year old daughter of mine would not know it was wrong to go to any house where a parent was not home. Especially if the only one home was a teen boy.
I think it is horrible that she was killed but parental blame can cut both ways.