Spoilers if you haven't seen it yet, and frankly I wouldn't bother if you haven't.

Someone explain to me how she calls the police, tells them there are murders going on, then suddenly disappears as the police show up and the police just kinda look around a bit and then leave? Then the little girl goes missing too and they don't turn that place upside down looking for her? The detective has evidence the rooms have been altered so someone can move between them and he does nothing?

The ending of this way 7 different kinds of stupid. No one watches movies like this to see the main character lose. It should have ended with the woman killing that old woman and her sons and saving that little girl.