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If you cant see it, then it was in her mind. A dream can be so realistic that a person may believe its really there. I had an experiece where I woke to see a figure that lashed at me with a whip missing me by inches. That was when i woke up and Mmy mind was still tricked into thinking the figure was still around. False awakenings blur the line between dream and reality. So your partner would have been convinced that what she saw was still inside the room.
However I think the paranormal option is also possible in some cases as my partner has a close connection with this type of thing...e.g.
Waking up to her telling me there is a man , people or other weird things standing in the room late at nite even after I have turned lights on can be quite disturbing at times esp as you can see she is clearly shaken. ..........
Just because I dont see anything, doesn't mean there is nothing there..