D.B.
Ok, I have never seen a ghost myself, but that is the first thing I thought of when I started reading your post.
My cousin moved to Portugal. The second place she moved into, she knew there was a ghost living in her bedroom. She saw it once at the side of her bed (I'm getting goosebumps writing this) and once she felt it lying in bed next to her. She said she was never afraid, but knew for sure it was there with her. My cousin would be the person that would call BS to this type of thing but I knew by the way she told the story that she was definitely a little freaked out. She never heard noises or had any objects, of hers, move. She has since moved out of there.
I think it might be time to look into the possibility that she might be seeing a ghost. I seriously cannot even believe I am writing this, because two years ago I would be the LAST person believing such a thing. Let her sleep with you (also something I would never suggest) or if there is another bedroom, move her into that room. Research the house. I know it's creepy but find out if anyone has died in the house. Then contact someone that can help u get rid of your spirit. Once again I CANNOT believe I am Writing this! I have no idea where you would find such a person, but here might be a start.
Good Luck!