Little Thieves by Margaret OwenCall Number: Teen Owe
"Vanya, the adopted daughter of Death and Fortune, has been impersonating the blonde and beautiful Prinzessin Gisele for the better part of the year. Using the Prinzessin's status to gain access aristocrats and rob them during high society parties, Vanya acquires a reputation as uncatchable and an alter ego: the Penny Phantom. While trying to steal enough gold to escape her divine godmothers, she accidentally crosses the wrong god during one of her burglaries. The Low God Eiswald curses her to slowly turn into the jewels she loves so much unless she can give back everything she stole—which means finding the real Gisele, not getting caught as the Penny Phantom, and getting out of this curse while all the gods are watching." (description from School Library Journal)