You aren't her caretaker. She's a big girl and can figure things out for herself. You should be enjoying your life and not spending all your free time cleaning up your sister's messes. It's not your responsibility. If she ever wants too get sober, she'll find out how on her own. That's IF she ever wants out. You can't force it. But you also don't have to watch her destroy herself. No part of this is your responsibility.