((MSC)) - Though it's already been mentioned, I wanted to emphasize this: You are not kicking her out, SHE made the choice to drink, knowing that was breaking your boundary.
When I was using, I chose homelessness. I could have easily gotten into the treatment program which helped with housing, job, etc. I could have easily come home or stayed with any number of relatives. I wanted to use, and all these places required I be in recovery.
It was only by dealing with consequence after consequence that I chose recovery. I am extremely grateful for loved ones who held on to their boundaries and gave me the dignity to live my life as I chose.
I am back living with family, thanks to the career/financial consequences of my using but the difference is I've got over 5 years in recovery and am back in school for another career. Your sister may, or may not, choose recovery at some point but it will be her choice.
Hugs and prayers,
Amy