I am willing to bet that this changed this girls life forever. Maybe not in a way that will effect her heavily so far as physically or in a way that anyone can tell but I know that it had to change the way that she sees and thinks about almost everything. And who knows what else if that spirit did not go back to were it came from then it could cause even more problems.
Ditto what Ghost1 said. Leave the Ouija Boards alone. We don't need any more portals to hell.