I'm surprised how many people still believe Delilah is the blackmailer, I think if there's one thing we can take away from this episode it's that it's not her, if anything she's being manipulated like with Ashe, first of all she didn't know that Ashe is a Duplo until after the sleepover, and secondly all the clues pointing to her are so blatantly obvious, it's like Dev is waving shiny keys around with one hand for us to see while flashing his middle finger with the other.
And you might wonder what the blackmailer has on Delilah to blackmail her, Delilah may be childish, but not stupid, imagine that the person she loves will be exposed to the world like the outcasts that Duplos are in this universe, obviously she would do anything to keep the secret of the person she loves even do whatever the blackmailer wants, probably that's why she so desperately needed to go to the party because she was ordered to for the blackmailer's plan.