Warm sun + 0 wind chill + being acclimatised to 5C or less. Same deal as people suffering from heat stroke in 29C when parts of the world regularly don't fall below that for months out of the year.
Well, she certainly planned this. Snowmobile to location. Big winter boots in the hole with her. Insulated liner to lie down on. Hole deep enough to hide from the wing. Probably just outside the frame is a snowmobile, shovel, and her snowsuit.
Source: lived in the arctic for almost a decade. This doesn't seem that foolish in May when the sun is nice and warm but the snow is still out.
Feel free to crosspost it! I'm always wary of posting in more places myself because I feel like I'm too omnipresent in the communities I already post in, lol.