im so sorry for your loss. you dont have to write on here what all her family had been through or what has happened because in the end it wasnt her, her is who she was underneath the addiction. give yourself some time to heal as i am sure you have so many unanswered feelings. i am truly truly sorry that your sister has passed so early in her life and that she has left so many people to mourn this loss. i too am an older sister, i have two younger sisters and know the bond between siblings.
deepest sincerity,