While we are waiting. Here is my other "out there" theory. When I was a kid we had a little neighborhood kid that always wondered, that always showed up at our place. Honestly...my parents were ANNOYED. There were many comments of "Why aren't her parents watching her??", pretending we weren't home, having to tell her repeatedly that it wasn't a good time. Don't get me wrong, we were nice to the little girl, and had her over to play plenty of times. But she always showed up, and oddly enough she would show up and ask if we were eating, could she eat too? Looking back now, it was the saddest thing. She obviously wasn't getting what she needed at home.
While we would never in a million years hurt that child, obviously, I can see someone else without the same morals, who maybe due to some big life event, snapped and had enough with her coming by.