Group idea for horror trailer

The trailer starts off with a young innocent girl called Chrissy taking two 7ish year old boys, Matthew and Dylan to the park, as she has been hired to be their childminder for the day, so she takes them to a quite park where they play.

Until Matthew walks into a nearby wood and emerges with a doll in his hand. After a while of persuading Matthew to drop the dirty doll, Chrissy goes back to her studies on the park bench. Later on Chrissy packs her studies up and goes to get the boys, when she realise that Matthew has gone and left Dylan point into the hole in the fence that Matthew went in when he found the doll.
Due to it being late, Chrissy starts to get worried and goes into the wood to search for Matthew, then realise that she has lost him she tries to call for help but doesn't have any signal and is running low on battery for her mobile, so she goes deeper into the wood to find him.To her shock she finds a series of dead bodies when searching for Matthew and then she comes across one of his shoes along with one of the dolls.
She carries on searching and find Matthew hidden in a bush with the doll in hand and his eyes blacked out,  she grabs the doll and gets a visual of all the deaths that had happen around the doll. And she finds out that Matthew has been possessed by the doll.