S1·E17 The Big Mixed Up Mojo Episode

In a strange reversal of fortunes, Dee Dee's charmed life seems to hit an unlucky streak at every turn while, ironically, the usually pessimistic Mona's life becomes auspicious from one moment to the next. When Dee Dee starts doubting herself after failing her assigned mock-court competition at school, with Mona's help she manages to regain her waning confidence by confronting a crooked businessman.