This episode is when Isabella has some problems because of the necklace.
Isabella's always wearing the necklace that Wendy gave her. Things get weird after she starts being mean to her friends.
(Isabella and Candace walk up to their lockers)
Candace: This party thing will be fun.
Isabella (talking quickly and studders): Yep, I can't wait for it!
Candace: Are you okay?
(Isabella gets a death grip on the locker)
Isabella: Never better.