When you look at the state of John Andrew's bed, and the supposed "packing" that Patsy had done in preparation for the cruise, the evidence does tend not to lead in the direction of Patsy's having done much of it, certainly not enough to be able to just come back from Charlevoix, grab the suitcases, and leave again for the trip. Here is a crime scene photo of John Andrew's room where Patsy was "packing":
What I see there is just a bunch of what looks like JonBenet's clothing (a pink bathing suit, a fur-trimmed coat she was photographed wearing on December 22nd, a black and white checked outfit that appears to be a dress she wore in pictures taken when she was three or four), apparently randomly thrown on the bed with one small suitcase nearby, but not anywhere near what people would usually considered "packed" for a trip. If Patsy was spending any significant amount of time in the bedroom preparing for the trip, how does this picture show it?