Clean Slate is the sixteenth episode of the third season of Braceface
Nina Harper's cousin, Petra, arrives for a visit from London, England—during the visit, Petra (noticing that Nina's still mad at Sharon Spitz about the doll incident) casually admits to being the true culprit. Sharon and Nina (the latter especially) are shocked to learn this—after learning the truth (as well as realizing that she's wasted half of her life being mad at Sharon for nothing), Nina does her best to try and patch things up with Sharon in the hopes of becoming friends again.
Sharon, understandably, refuses to go along with whatever Nina has planned—but after a talk with Griffin and then thinking things over, Sharon realizes that being friends with Nina again might not be that bad, especially since if she and Nina do become friends again, it would probably be the end of Nina's abuse towards herself and her friends.
However, during the time Sharon spends with Nina in their attempts to patch things up, Nina basically forces Sharon to ditch her other friends and forces her into things that only Nina likes do, such as cheerleading (which not even Maria can imagine getting into). In the end, Sharon decides that being friends with Nina just isn't worth it, as they've just grown too far apart to really make compatible friends.
After Sharon patches things up with Maria, Connor, Alyson and Brock, Nina gets mad at Sharon for ditching her for the others (seeing it as "ungratefulness") and gives Sharon the head of one of her old dolls as revenge. But Sharon doesn't care and feels that her and Nina are ultimately just better off as enemies instead of friends.
CLAIRE: I'm sorry. Do...you...exist?
SHARON: I'm Sharon. Nina invited me.
CLAIRE: Yeah, right!
LANIE: I think the dentist cranked her braces too tight! (Giggles)
NINA: Sharon! Claire and Lainie are such kidders!
LANIE: Of course I'm kidding! (Giggling). I love braces.
CLAIRE: (Laughing) I want braces!
NINA: Come on, girls. Let's get Petra and head to the movies.
- This is the only appearance of Nina's cousin, Petra, the true culprit behind the doll incident. Also, Petra doesn't give a reason on why she decapitated Nina's dolls, other than simply stating that she "was a nasty little brat" as a kid.
- With the exception of Lauren's son, Griffin, none of Sharon's family appears (though she mentions her dad and her older brother).
- Despite what happens in this episode, the series itself implies that Sharon and Nina will eventually become friends again (albeit probably not as close as they were when they were little kids).