Your sister REALLY needs some help. I'm so sorry that this is happening to you, but frankly, it reminds me of what may happen to my 16-year-old sister (she's messy, irresponsible, does poorly in school, and screams if I tell her to do something).
My primary concern was for her daughter and dog. Have you ever seen her physically abuse them? If so, you should contact someone. If not, I think she still needs therapy. Try leaving a packet near her stuff about therapy and counselling. Maybe a note would work too.
If you have moved out, you are the responsible one. Don't let her get you down. And don't let her keep you away from your mom and dad and grandparents. Just ignore her.
Good luck.
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