In every potential disaster situation that I've had; there were two critical events: the moment I realized things had "gone to $h!t…" and the actual moment when things really had truly "gone to $h!t…
I know some of you and I know that the moment they realized that "things had 'gone to..." it is when they read the avy post saying moderate or higher rating.
For the hiker on the traverse, doing her trip in winter, at ten F without wind was the best situation. what she wear was probably adapted to those situations. Doing at 0 F...and shit appear, doing it at 0 F with 50 miles per hours wind...and it is worse...doing it as minus six with 50 miles per hour wind...it is arctic weather.
As she want to do the Everest, and as experience trad climber do, she should had divided is challenge in portion where she can turned back. First, is she wearing arctic clothes, did she know where to get out of the ridge...etc.
Never forget that every person have a different signification of things going bad. For experience climber, canon in thunderstorm is not so worse. Personally, I like to climb pinacle in extreme avy post, in a white out...and I did it many times. But I won't do it two or three days after a snow storm, when we have blue bird sky and moderate avalanche danger because for me the things goes...
Should remember what smart pig said: Think about how YOU would deal in the prevailing conditions
and be carefull at those guy who told you to avoid instead of learning gradually.