I was re-watching the season 2 premier (unmAsked) and I noticed something strange. Not sure if this is ever addressed in the show. During the masked dance, after Caleb comes up to Hannah, a girl walks in behind dressed in a red dress using a gold mask. She is blond, tall and thin. It seemed significant because of the colours they have chosen (colours that are proven to catch our eye), the camera keeps her in the frame until she walks by Mona, and she is very well lit when she first walks in.

Anyone know who she was? Any ideas? Any theories as to why they would highlight this person?