So, I guess after....(spoilers)
...the house started collapsing, and creepy ghosts tried pulling me into the basement, I probably wouldn't go back in that house. In fact, I'd have probably left after the toy tractor moved and dinged by itself. That would be enough to totally freak me out.
Yet, this teenage girl just accepts her father's admonition, as teenage girls are wont to do, and then goes further and tries to draw out the ghost.
I'm sorry, but that was a real weak point in the plot structure.
I'd have run all the way to Canada and not looked back if that had happened to me.
Apparently, the ghosts just happened to encounter the bravest teenage girl in the world.