ok, then just tell her how much its bothering you. Tell her that honesty matters to you, and your being honest, and that her just coming and taking your car, and yes, it is yours, bothers you alot. if she needs it, she can ask to borrow it, but to just show up and take it is plain rude and disconcerting. in my opinion, she is showing a lack of respect to you, and acting like your married....... maybe she is trying to give you a hint.