Originally Posted by Jamie!
It is weird like, but..
If all the alibis they have are true, the time line makes it impossible for the body of Maddie to be hidden, I would have thought. 30min before Kate discovered Maddie was missing, another doctor checked on the kids and they were all there, safe and sound. When Kate arrivied to check on them (30min after the friend has) Maddie was gone. She called the police 10min later. I presume Kate was looking frantically for Maddie during those. 10min after calling, the police arrived. That leaves 20min at an absolute maximium, for Kate to kill Maddie, and then hide the body in such a place, that it wouldn't get found.
Going of the alibis, it's just not possible for Kate to have killed her. Unless.. the friend of the McCanns who had checked on the kids 30min previous to Kate, is also in on the crime.