You cannot make your sister do anything. Unfortunately, she is not a puppet on a string.
I have a sister like that, maybe even worse, and I decided that I could not deal with her costic personality any longer, so I chose not to talk to her, and this trend has continued for 5 years or so.
I told her what the name of the game was and showed her where the boundaries were located and if she violated said boundaries she knew what the consequences would be. She violated our terms of peace straight away and because I am a man of my word I was forced to set her free.