Our expert says:
You're right, Rodger, that attacking this guy won't solve any problems, and will probably cause several more.
The problem seems to be that this guy has lousy manners and poor communication and tactical skills. YOu would do better to befriend both of them and seek a social occasion like a coffee or meal with them, to chat about what's going on, and to frankly express your concerns. Find out what's going on, and improve their communication with you and your parents. At 18, she is probably legally able to do as she pleases, which unfortunately includes the right to be foolish, if she insists. Lee, Sister Zazi and others have useful comments here
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