Earlier quoted context omitted.
> and the emotional upheaval from her isn't worth it either. If you loved your sister, you should do something, if direct confrontation isnt working, take another route. > In my culture this is exactly what family should do. I assume you mean "family should intervene here", because if you don't who would ?
Sure, you may try (I did and don't regret it, sounds like OP also tried), if only for you to feel better about it yourself. But my experience with addiction in the family is that they can and will drag you down with them. To love is to let go, at some point. My experience (with alcohol addiction) is: Tried to help once, got into problems (set family up with house of a friend), almost got into financial problems mysel…
As someone who had to give up on a close friend and addict, you have to set razor sharp boundaries for yourself. And if that doesn't work you have to leave. I think very few people have the capacity to make the right decisions when a loved one is slowly slipping into a hole of misery of their own making while begging you to keep them company on the way down.