gosh, i'm so sorry, i really feel your pain, she's at peace now and her struggle is over. what addiction does to people and to their love ones is so sad. ipray that god will give you added strength to be able to move on from here. i pray for your siblings too. i'm so sorry for your loss.
i lost my brother, my father, exhusband 3 cousins and an uncle to addiction, so i do know your pain. its never easy but in time the pain does get a little easier to bare. remember that she lives on in your heart and your memories.
i'll continue to keep you and your family in my prayers.