Consider behaviors after an accidental death in which panic would lead to a cover up:
-body is possibly tampered with to remove evidence-found naked, etc.
-body is removed from an accidental death location
-body is placed in a second location: her vehicle
-body is placed in yet another location: where body discovered
-deceased's iPhone is dumped at yet another location
-deceased's mini-van is placed at yet another location
-insert timeline made by SouthAussie (thank you) here
http://www.websleuths.com/forums/showpost.php?p=9052538&postcount=89...and
IMO, behavior appears collected, deliberate, well thought-out...not frenzied and panicky.