When Mildred was first brought up in the second season of Summer Camp Island, she was just a small part of one episode. When Emma had one of her books in the fourth season though, gears started turning in my head. Now that season 5 of Summer Camp Island has released, I see even more reasons to think that Emma is actually Mildred.
Summer Camp Island is playing a long game with Mildred, so we’re sure to see more of her story. Eventually though, I’m sure it will reveal that Susie’s sister has actually been with her for a long time.