Ok just hear me out on this because im sure i have something.
Replay episode 4, get to the house with the attic zombie and look at the family portrait in the room where omid rests, look at the lady on the right and remember her face. Now at some point in the episode there will be a cutscene ( it happens sometime AFTER molly comes back to the house with kenny and clem ) and that cut scene will show interier shots of the house, among these shots you will see a PICTURE frame that is smashed and the PICTURE REMOVED from it.
Later in the Episode molly may show you a PICTURE OF HER sister, look at the picture, get a good look and notice how it kinda looks like a younger version of the lady in the FAMILY PORTRAIT, its not impossible to think that people have framed photos of them selfes in there own homes right? i think molly stole it to make up the whole dead sister rouse so she could steal the boat and she planned that in episode 5 ( thats why she suddenly left in episode 4 )
Maybey she ran into vernons group and saw them take the boat and couldent stop them, and io think molly and her sister are the 2 people at the end of episode 5, and we will be MOLLY in season2 or the new content
PS will put up screen shots when i have time