I have been wondering whether we will see Emily as a playable character in a game later on. Her "secrets" might very well be contact with the outsider.
After kidnapping Sokolov (I believe), you can visit her. She's sleeping and seeing nightmares. If you try to talk to her, in a couple of phrases she says something like "why your eyes are so black..? go away". I think it proves that she saw the outsider.