So I can imagine that behind this mask could be Priscilla.
Priscilla represents the MC's family, and his family is rich, has power, and is ruthless. She is also the one sitting at the screen monitoring the images from the cameras.
Lynette's parents make money in hotels. Where did Emma work for a while? In Las Vegas. What picture does Emma see? The one of the MC in Zoey Diary. Where are there a lot of hotels? In Las Vegas. Who has a hand in Las Vegas? The mafia.
So it's no wonder Lynette went back to Neil. She was pregnant and didn't want the MC to have anything to do with it. The only problem is that the MC is the only descendant of Lynette's family. And when the king (godfather) dies, someone has to take the throne. But before the MC takes that throne, he has to prove that he is not gay and will produce offspring to pass the throne on to.
The reason Priscilla is at the party, simple. The cameras transmit the image and not the sound. Priscilla has knowledge of this so that Maya and the MC fuck each other. EP8 Classroom with camera surveillance. Maya is honest with Stephen, though, and says she first wanted to commit to the HOTs because of the rumor. That's why Maya doesn't get the scholarship and Stephen calls Priscilla and makes an assumption so Maya is just after the money. Priscilla has to go to the Halloween party because the cameras only show pictures. She gets the information she needs to make a decision.