There's a girl in my dreams...

I didn't have the dream, but my group of friends and I have all had the same dreams at times too, and it usually seemed to be something that seemed rather mundane (like the little girl playing would be mundane) rather than overtly paranormal. It's very interesting that this should happen among your friends as well. I wonder if perhaps this little girl is a ghost who is trying to speak to someone, or if perhaps she is simply someone's memory. I have some memory issues because of post-traumatic stress disorder, and I know there have been times when my closest friends had dreams that were MY memories... we sort of concluded that I had been trying so hard to retrieve the memories myself that I had passed them on. I'm not saying the little girl is you, but perhaps someone you know or came into contact with. It could be any number of things really, but it's certainly interesting. And a nice break from your normal dreams, from what it sounds like.