Wouldn't it have been better if...
the youngest kid (Christopher) that the babysitter was trying to kidnap was actually her kid who had somehow been abducted years earlier by the "good" mom and dad? Of course, this would mean that the flashback during the storytime where it explains Emelie's baby died would had to have been cut out.
It was an ok movie, but I just think it would have been better with a twist of that sort thrown in.