Graphic warning!
(snip)
The rape made her bleed, and she put on her underwear and shorts for the ride home. They got stained with blood.
Probably at this point, GG made a decision to kill her so that this would never be found out. He tries strangulation but it doesn't work so he starts beating her head.
She dies.
So then he is now sitting in the car thinking about what to do. Where to hide her. For whatever stupid reason (I say stupid because kitsap county has many wooded areas, why pick the one two houses down from yours?!), anyway for some reason he decides on the woods that he knows.
The other car scenario that I don't want to think long about is that she was violently raped and the strangulation and beating were part of his rage. Actually, this might be more likely.
On the way to the woods, because the underwear and shorts are now off of her body, the question is why?
Did he intend to keep them? Did he rape her again after she had died? Did the fact that the underwear and shorts were even found mean that he left them as a clue as to where to find her body, or did he lose track of them in the dark and intended to go back for them on Sunday? But maybe Sunday his parents kept him busy and by Sunday night, the neighborhood was going on the search so he dared not enter the woods at that point.