Hang on a sec....I get the point that her other big climbs were on guided trips and the hard decisions were made for her.
But don't most, if not all, guided trips involve educational components about safety and decision-making?
In addition, this was a bright person, and even though she wasn't from the area, I would conjecture she had at least heard through the grapevine about Mount Washington's "World's Worst Weather" reputation. Lastly, you said yourself she ignored the weather report. So to me, all of that taken as a whole seems baffling that despite her: a) experience being in harsh environments on guided trips with some climbing safety education, b) knowledge of the weather report, she would nonetheless chose to venture out - and without snowshoes, bivy, etc...That poor unreasoned decision-making just doesn't make sense to me.
Then again, I've definitely made bad decisions before too, but yikes!
It would depend on the climb and guides, if you are local here, EMS, Chauvin, IME, and your doing a winter Washington trip, sure, their is some education. Same with RMI and Rainier, which is looked on by some as the peak of places they will go, for others as a warm up for Denali. I don't know who her guide was and how many days they were together, or their record either. (more on that later)
In reading Into Thin Air, The Climb and Beck Weather's book, what they seemed to be looking at is can you handle the gear, (John K, commented that some climbers seemed to have difficultly with crampons.) They focused on how to traverse the ladders, how to "hook/tie" into the fixed lines. how to stay hydrated and making sure they are eating well and look out for HAPE/HACE etc. Part of me would think that as a guide, I don't want to educate type A personalities on how to determine weather and what the difference a hard but doable day and how thin that line is between going and not going. You certainly don't want a debate with your clients who you've educated on second guessing you. I know with scout groups and school groups, I was not looking at debating with others, scouts or parents on whether the plan was safe or unsafe & that was just local. A guide doing high altitude trips runs a delicate balance between getting clients to summits and keeping them alive. Bailing too early or having clients die puts you out of business. (The 2nd more tragic and sad)
I have no idea what Kate's summit days were on those big peaks, they do have beautiful days (whatever that means at 18-22K) and a beautiful day on Denali or Aconagua or Elberus is better than a brutal day on the Rockpile.
As for Washington's weather, as we know, that same weather applies to Jefferson, Adams, Madison and Monroe. (It's probably 90-95% the same on Lincoln, Lafayette, South Twin and Moosilauke, Katahdin, Marcy & it's highest neighbors.) I wasn't surprised that someone would get in trouble last weekend on F-Ridge. The hike is immensely popular and few discuss the weather of Lafayette. The alpine zone up there is fairly broad and it's cairns and features are not very distinctive. On the ridge it's narrow but not on Lafayette. I'm unsure how many of the new hikers understand Washington's weather extends to the other higher summits, they just don't have weather observatories on them. (Same as Avalanche danger in Gulf of Slides, Madison Gulf, Great Gulf, along with the Trap Dike and on Wrights and Gothics which by the slides on these peaks should be fairly evident but other than Tucks and Huntington, there is no "official" report.
In Winter I prefer doing the loop by going up OBP and down Falling Waters as I can decide at the Hut whether I go up or down and then again as I get out of the trees before heading for the summit. On the summit you make a decision to go back down or across. If it's okay to cross and then changes on the ridge and isn't so bad that a descent in the pemi is required to save your life, (which meant I picked the wrong day), getting off Little Haystack is easier, either down Falling Waters, which gets back into the trees pretty close to the summit, unlike leaving Lafayette, or staying on the FRT, although much fewer hikers do the ridge between little Haystack and Liberty Springs Trail and descending the rocks can be a bit tricky there, worse IMO than descending Liberty heading to Flume which requires some care in winter. In other seasons, I prefer up Falling Waters but it's not that big a deal.
To piggyback on Skiguy's reply, the worst the weather is, the fewer bad decisions you can make. In fact, they don't even have to be "bad", they just may piggyback with others. (If I hit the trail at 1st light and go past my turnaround time but two lights and extra batteries and know the area & I go past my time by 30 minutes is different, it's different if I get up late, I haven't checked my lights lately & I am looking at a summit sunset) I've seen summer hikers with little gear drinking beer on the C-path late in the afternoon heading up as I was on my way down, they likely got down just fine.