Susie isn't featured in Sister Location; however, many fans get her character confused with Elizabeth Afton, who possesses the spirit of Circus Baby. Although I can understand the confusion, it's integral for fans to separate the two characters as their personalities have very different impacts on the Five Nights at Freddy's lore. When I started getting into the game, all the characters made it very hard to keep up, and I would often get Elizabeth and Susie confused. But when I read Fazbear Frights for the first time, it helped me understand their differences. So I can't recommend it enough!