I simply don’t believe she had enough time to get all that creative. She had 4 hours in broad daylight to drive to her destination, do what she did, hide his body, then drive back.
That’s not even factoring in any potential stops she made along the way.
She’s benefited in the form of vast open spaces, and snow cover. They have to be searching these areas for a reason, and I don’t think that reason is “this place is as good as any.”
This occurred in broad daylight, in a fairly conspicuous vehicle. Cameras, witnesses, GPS, or phone records; something is guiding them.
Sometimes it’s better to be lucky than good, but luck has a way of running out.