Oh it's not the snow. It is simply that she has become afraid of roads in high places, even if protected by walls or guard rails. It is something that has really only become severe in the last few years (and before anyone comments it has nothing to do with my driving style).
One of the roads we took on the way back from the factory in march was the Gorge of Verdon (the Corniche Sublime) but she was so terrified that it took any enjoyment out of it and she refused even stop to look at the view!