dead
An hour is still an hour. I would dare to climb back up to get on the road, with a slim chance of staying the night in my partner's vehicle with her saving her life, as opposed to somewhere off the road where nobody will come by except maybe a hungry wild animal.

I can carve out a snow cave anywhere along the road in a little bit if I really need to but I would at least be back on track and still have a chance to reach her in time, if she isn't dead already.