The police seem to be downplaying that possibility for now, but the evidence isn't fully developed yet. The computers are going to be an interesting source of information, and I'm sure the P.D. boffins are already taking them apart.
Of course, there are all sorts of intermediate possibilities - that she knew he was going to "take her away" but not that he was going to execute her parents as part of the plan.
And she does sound like an out of control kid . . . I do hope that she was not in on the murder plans, that would be WAY out of control.
I will note that an old doctor friend of mine used to say that crazy people find other crazy people to keep them company. Her poor parents, indeed! (I also feel sorry for HIS parents. It's mighty hard to believe that your son is a monster.)
You might have hit on something there!
I don't think Kara was in on a plan to murder her parents. I do think she contributed to the hysteria. No telling what she and the boy were talking about. She didn't want to break up with him either.
sw