That she has truly accepted Vishal as her brother and no matter how many people try to tell her he's not worth it . She gives him the benefit of doubt and stands by him.
Although I know from. Vishal's point of view it's hard to have a strong opinionated sister , where in it becomes difficult for him to play the game.
If she continues to consider him brother outside the show as well I think she would shine as a person.
I remember in season 7, Prince kept getting warning like this against the sister he made on the show but he never let her side even when she was wrong many times and finally he won the show...