At least two of the articles I read state the opinion that Debbie was alive when she was dumped/dropped off. Is it possible that she was dumped/dropped off elsewhere and crawled to this location? I would think that this information would be released, but then again it might be one of those details that law enforcement hold back.
It could be, but I think if the ground was wet and icy, there would be some evidence on Debbies clothing whether it was released or not, if she had moved to the location she was found herself. Especially based on the weather conditions you posted for that day and the days leading up to the murder.
If Debbie was alive for a few hours where she was dumped, it also makes me wonder if the 'pen knife' LE thought couldn't be the murder weapon, perhaps could have been. We don't know how much blood was on the scene where she was found. But maybe that weapon wasn't enough to kill her immediately, but was enough to leave her with wounds that left untreated could have caused her death a few hours later.