I believe that I've found where you're stuck. At this point of the ghost quest you should be able to find her at the house during the daytime. Talk to her, fight her, and lose to her once again. If there's nothing wrong with your game, then Evie will come running into the house while you're possessed and the two of you will head back to the guild to end the quest. After the ghost quest you should be able to talk to Edgar at the guild for new quests and find new areas.