Sometimes children don't know how to make friends super easily, so they try to find their best bet. in which they either make up their own or they "find" a friend. Kids are clueless sometimes and don't know what is what and are just trying to "fit in". Many kids don't even know if their friend is a "ghost". Sometimes in a kids mind ghosts are just regular people who want to be their friend. They also just want a friend, so they just make it their friend immediately It all depends on what the ghost is.
