If she was that clueless why did she run after his car as he was driving away and tell him she wanted to go with him and get married.... she would have to step over her fathers' dead body to get out the door, so certainly she knew they had just been murdered. At 14 you know the difference between right and wrong.
I think the girl is just as psycho as the bpoyfriend.
The Mennonite Bonnie and Clyde!