Okay, first look into a local phychic or medium near you. Ask to talk, and explain what's going on. Even cheesy or touristy looking places can be legit. If you don't find someone like that, take a picture of the room, and the view of the house you saw her from. If you look on Facebook there are a number of people that are psychic with pictures. My mom's like that. It scares the crap outta me sometimes. Mom sense on a whole other level.
Also if you're willing to do the research, fund out who lived there before if you can, that can go a long way to figuring it out too. The life and death if a person can have a lot to do with them still being there.