I probably missed it by why is she living with you? Can she not go anywhere else? From her behavior and your other threads it sound to me that she will not change (at least anytime soon) and your best option is to boot her out. Sounds tough since she's your sister but my gut is telling me she will not change her ways and she needs to learn the hard way as to what being an adult entails. I don't see this living situation becoming positive for you unless she's out of the house completely.