My friend wrote this off the top of her head one day.
Synopsis: a little girl that everybody loved but one day her shadow had enough of just being a shadow, so it took over her body and the little girl was the shadow now and the shadow was her! She had to find a way to get her body. Meanwhile, the shadow was a cruel one, so when it took over, the shadow would hurt people and the little girl couldn’t do anything about it… The shadow wanted revenge; it murdered random people and one of the bullies goes missing (a secret murder). The little girl comes in shadow in an attempt to stop the imposter, getting her body back in the process… but not without the attempted murder of her BFF coming about!