On Mona's role in the finale: "Mona comes to the prom to uncover a mystery that has to do with Charles and A, and everything that she’s been through with the girls," Parrish divulged to TV Fanatic. "She comes to find the girls to, basically, say let’s go put the pieces of the puzzle together. Mona’s [being] there is kind of the reason why they end up finding out what happened. Mona’s always lurking around, for better or for worse. In this case, it ends up being for good.
On Mona's surprising piece in the finale's puzzle: "There is one big shocker that does have to do with Mona that I was, like, 'Whoa, did not see that coming.' But everything makes perfect sense."