<human>: Provide a brief overview of the text.

My little sister Marie has exhausted every avenue of support she has been extended. We grew up with my mother who is now technically homeless although she has friends she stays with. Marie has been kicked out of my other sister's house, my father's house, my grandparents' house, etc. for breaking rules and being disrespectful and manipulative. These rules aren't unreasonable, like keep a job and do your dishes. She has been staying with a friend and friend's mom but is now being asked to leave for not paying rent (because she won't keep a job, usually by showing up late and/or unprepared), disobeying house rules (no sleepovers), and stealing liquor from the mom's liquor cabinet, among other things. Friend told me today that they are kicking her out. I have told no one in my family. 

Any time I have had a serious talk with her, she breaks down and feels remorse over her behavior and wants to change and support herself and go back to college, blah blah, but then goes right back to her dishonest ways. She is a hard worker when she wants to be, and I feel like if anyone can get through to her, it's me. But after the last 4+ years of hearing "I want to change!" And seeing no changes, I am inclined to think that tough love may be the answer and that my family and I need to let her fall on her ass hard. This worries me since my mother has set such a low standard in her own life.

Are there some magic words I can say that will impress some industry and motivation on her before she ends up at rock bottom? If not, what can I say to her on her way down that will encourage her to see how it is her actions that led to this and she is capable and deserves a much better life for herself?
<bot>: little sister struggling hard to be an adult and support herself. Has abused all help offered to her. What is the best thing I can do?