The Fourth victim was actually a robber named Jess who tried to break into the mansion. The Genie decided to teach her a lesson that she would never forget. First she turned her into a kind of snail/human hybrid, her body below the waist was connected to a large snail shell that was now a permanent part of her body. The Genie then gave her snail like habits, like when she gets surprised or scared she would pull her upper body into the shell. And finally, Jess would leave a large, gooey, disgusting, and smelly slime trail where ever she went.