- "Let's get crazy!"
- —Kirsten, excited about her birthday party
The daughter of one of Jodie's colleagues, she is the stereotypical teenage girl — rebellious, blunt, and entitled. She is friends with Steven, Matt, Emma, and Jen; they all appear to be close, and could have possibly known each other for a long time.
She throws a party for her 17th birthday, and, at the behest of her mother, invites Jodie. Kirsten wants nothing to do with her however — she subtly mocks Jodie when she drinks beer and smokes marijuana for the first time.
Upon opening Jodie's present, a poetry book penned by Edgar Allen Poe, she becomes furious. She insults Jodie, saying she shouldn't have made the trip if she was going to give her such 'crap'. She then, with her friends falling into line, singles Jodie out and tyrannizes her.
If Jodie decides to take revenge using Aiden, she will call her a "witch" and accuse Jodie of trying to kill her when her mother comes home.