 Betty-Ann Mulvaney is a doll owned by Jen's Latin teacher, Mrs. Mulvaney.She is stolen by popular jock Kurt Schraeder, who swipes her from Mrs. Mulvaney's desk as the senior prank.Throughout the book, Jen makes several attempts to retrieve the doll, but doesn't succeed until she and Scott coerce Kurt's little sister Vicky into giving them the doll with a threat of blackmail.