Things would be so much easier if we could tell someone what they need to do and they follow through. Unfortunately, it's not that easy.
As a recovering addict/alcoholic, I know when I kept relapsing, it hurt when I got nothing but anger from my family. That lead me to believe even more strongly that I was the complete failue I always thought I was. I'm not saying that you shouldn't share your disappointment (that she relapsed) but make sure you let her know that you do love her. Us addict/alcoholics have the lowest self esteem known to mankind.
I'll keep your Sis in my Prayers. I lost my only Sister to this disease back in '91. I don't wish that heartache on anyone.
God Bless,
Judy