At first I thought she did it so she would get the publicity and get noticed by the guy, but with that answer there is no guarantee that he will contact her and even if he did then she would go to jail and not be able to be with him anyway.
But if she killed her sister and gets away with it (just like she did with her mother) then she'll get to see him and they can finally be together.
But if she killed her sister and gets away with it (just like she did with her mother) then she'll get to see him and they can finally be together.