Diana was simultaneously Veronica Sawyer and Heather McNamara - our protagonist, and a supporting role to the “big figures” of the environment of the backstory (which was inspired by Heathers), and she actively enjoyed the toxicity of the situation - that is, being part of the popular mean girl’s clique. There is ultimately good in her at the end of the day, but less than some may expect. In the same way that she assumes traits of the vampires (Forrest the friendly jock, etc.) the same happens to her in turn.

Close to both the varsity quarterback of the football team and the cheerleading captain, teenage hormones make things a mess in this kinda-sorta love triangle. She did like both, probably due to decent chemistry but also their high school prestige tm - likely a sort of self-fulfilling prophecy, where she wouldn’t be super crazy about the fact that they’d have vulnerable moments like any other human being. Things were coming to a head as she tried to balance the love triangle that threatened to make her (act like an adult and) decide just what she was going to stick with, romantically but also in terms of moving forward after high school.

Then the JD figure comes in, a mistreated loner angry at society after being wronged, and the body count wracks up. She doesn’t know why he did it, missing key parts of some sort of story, and she thinks she doesn’t care - but it does feed into her perception about only kinda being the center of attention enough to be privy to all these intimate details and motivations and connections. He’s caught - whether through her hand or someone else’s, we can’t say ourselves - no one else is hurt, and all she’s left with is herself. Her part of the story, her perspective and thread, is gone as high school is forcefully shed away to university.

She’s relieved that she never had to make a decision regarding the other two, or having to make that difficult decision and someone else making it for her. She’s also incredibly guilty for thinking that.

Beyond that selfish thinking, she’s still deeply affected by their deaths. As those two relied on her as a crutch, she did the same in turn, and she’s not sure if she wants to risk reaching out immediately after their deaths. She’s not sure how much of herself was merely taking cues from the others this whole time. She feels distanced, awkward from herself as she gave credit to certain emotional successes (confidence, charisma) that she grows rusty beyond video making - which was never a two way road, not really. She was just lucky the way she presented herself felt relatable and “friend-like” to her viewers in contrast to the more high key makeup stars that dominate the business scene at the moment. Some of it is sincere, but not nearly as much as it portrays.