A girl who seems relatively stable but actually has serious issues. Some issues include: bouts of low self-esteem, inability to communicate effectively, and having serious social issues. Freakshows often have one minor, yet incredibly significant glitch that keeps them from being great friends or girlfriends.
Sarah was smart and cute, but she flaked on her friends a lot. She sent mixed signals, and was just difficult to socially vibe with. Some days she'd be fun and happy, other days she'd be demure and sad. A real freakshow.