A Dream I had when I was about 4

It was nearing sunset as I was dragging the lifeless body of a young girl through the forest. She was wearing a formerly white nightdress, now stained with blood and dirt. Her blond hair a tangled mess of pine needles and leaves, marking a trail of where she'd been.
I found a building in the forest where there was a public restroom. As I walked in, there was a sink directly to my left with a small mirror above it. I washed my hands and face, feeling calm and refreshed, and then looked up into the mirror. Expecting to see my own face, I was shocked and filled with fear as I saw her face staring back at me, with a cold expressionless look.

(and if anyone can tell me what a 4 yr old was doing having a dream like that, that would be awesome to know...)