let us not forget this video interview with the friend who last saw her
http://www.ksl.com/index.php?nid=148&sid=9029772
(click on interview with powell neighbor)
highlights:
the woman was invited over by SUSAN to work on a crochet project
the two women ate dinner in the living room while working on their project while Josh and the children ate in the kitchen
Josh, per the woman, kept coming back in and talking to them throughout the time Susan was AWAKE.
Because shortly into the time working and eating with her friend she became so tired that she asked her friend if it was okay for her to go lay down on the bed as she was so tired!
after Susan lay down to rest her friend continued to work with 'the yarn' and Josh told the woman that he planned on taking the boys
sledding.. but no plans were mentioned of camping... just sledding thus giving an alibi for him to be out of the home while Susan was lying down.
This same woman said that it wasn't until much, much, later that she heard of the camping trip.