Mariposa - (The Fantasy World of Nancy Springer)

Aimee believes everything in her life is great. She's got a boyfriend who's terrific (in bed and out), a penthouse apartment, and everything else a girl of privilege could possibly want. Well, except for a soul. That seems to have gone missing somehow. After a trip to a Warlock Doctor confirms that her soul has indeed vanished, she's left with two options: buy a prosthetic one, or try to figure out what happened to the original. Feeling that she must have left her first one somewhere where she could find it, Aimee enlists the help of her mother and grandmother in a hunt for the wayward soul. But Aimee's search for the missing part of her is about to bring forth some long-forgotten memories, and she's going to learn what it really means to have everything in life that's really important.