I've climbed Washington, Madison, Adams, Jefferson a number of times in winter. They're simple climbs, just crampons and ice axe. -15*F without windchill was not uncommon. Have been in some pretty good winds and storms up there.
HOWEVER, I would never have broached treeline with 100 mph winds @ -30*F... if the wind is 100 mph when you hit treeline and you don't turn back you're completely without the skills to have been there in the first place.
Spunk is one thing and I always admire that, but I'd say she was absolutely out of her depth to make the decision she did.
By the time she hit the treeline, she might have already been suffering from hypothermia and unable to make rational decisions.
