Problem arises when Brenda invites her rough and aggressive younger stepsister Nadine (Halley Wegryn Gross) into the group without checking with Shirley. She soon starts her own competing business behind Shirley's back, and Shirley starts to lose customers. Shirley confronts Brenda and Brenda agrees to search Nadine's room. She reports back that she found nothing. With Michael 'on watch', Shirley and Melissa search Nadine's locker but find nothing. They end up trashing the school to hide their true motive. The next day everything was destroyed, which called for a mandatory assembly. During the assembly Shirley calls the girls to the band room to discuss the issues. Shirley than tells Nadine to stop going behind her back and doing business without her permission and that she gets twenty percent of all their cuts. Then they all are dismissed.