Cordelia Chase from Buffy is a typical enneagram type 3. I see many American women especially following this same behavior, with the idealization of celebrities. She can be very outgoing but also biting and mean, completely trashing other people and ignoring their feelings.
american culture is sooo weird to me cause in high consumer outlets you have this thing where people sell a lot of high-priced shit and shit, and then you see homeless people and hippie activists near these places and it just seems surreal, bizarre- almost as if both the social worker and the consumer has to find some way to integrate themselves, like in more college-y towns, but you never see it, and it really annoys me. (Both the loser social worker and the high achiever and how... separate and distant it all is.) It feels soul-draining. I hate big cities lol.
Anyway, her bitchy attitude was fine in high school, but then she realized she cut off all ties to help her because of her shallowness and vindictiveness. She was unable to form 'emo bonds' that the 4s and 6s care about, and cared only about status, and it simply bit her in the ass. It woke her up fast, and she realized she had to start moving into her integration area - truly feeling other people's feelings and helping them overcome their psychological difficulties that keep them helpless. She then really grew to be a selfless person, until she kinda went too far in the other direction.
Then when she came back to life in that one episode (as an astral projection from the gift of the powers), she had a balanced self- and was able to integrate the contradictory natures within her. So she was self-confident and assured about helping others. She was a much better version of herself.
It's no mystery that 3s grow by being more like me - 6s. Her relationship with Xander (a 6) was all about this need. Also 6 and 4 writers are always very, very adapt at noticing when a 3 has become a sell-out, or if they're being truly honest and empathetic about what they're trying to accomplish/sell.