[user104658]

Exactly, she was upset the night before and a door was left unlocked. Yes, you would panic, but the first thought would be "she's gone off looking for us". And like I said there was never any further evidence of an abduction. It's perfectly feasible that she DID wander off and got into some sort of accident and has simply never been found. But they screamed "abduction" straight away and have never wavered from that, despite there being absolutely no evidence of an abduction.