You strike me as someone who really likes taking lessons. That is fine. She is opposite of that and really does not like taking lessons. I have not taken a lot and have not gotten a lot out of ones I have taken in recent years.
I do enjoy taking lessons, but I have nothing against people who don't! Most of the people I ski with are more technically AND terrainally (totally a word) proficient than I am, but there are some who are really kind of a hot mess for technique, but they will ski things confidently that I wouldn't touch. And that's just fine. I do wonder why someone who doesn't like lessons would inflict a week long lesson program on themselves. I wonder if she (and you) wouldn't have been happier at a self-described big mountain series, like Jackson Hole Steep & Deep camps ...
I am looking forward to the Taos ski week and am expecting to be taken to some cool, challenging spots with the best snow on the hill. If I can become a better skier along the way I am good with that.
I haven't done the Taos ski week, but I wonder if it's the right tool for that job. Perhaps it is! And perhaps they'll see your skiing and put you in one of those groups. I agree it's kind of befuddling to use technical skills on a relatively tame slope to determine terrain choices. Perhaps a better approach would be to ask students about terrain preferences, then compare that to how they do in the ski-off, and try to build groups of like-minded people and similar skills. But I guess no approach is perfect. The current ski-off sounds like it is biased toward technique improvement, which isn't too surprising, as that's instructor catnip.
I totally get what you're looking for - that's what I want if I'm going to a new ski resort. Heck, that's often what I get out of my mid-season lessons. But from an instructor point of view, I can well imagine that if they don't see certain technical pieces, they might see a person as a liability. This is why I wonder if the Steep and Deep camps might not be a better fit - I have friends who've done them, and they do a ski off through truly gnarly terrain. I'm sure they're looking for very different things than are the instructors at Taos.
The other option, if you have the resources, is to book a private or semi-private lesson in which you specifically request a guide who can take you to that stuff. Breck even has a Guide program that allows you to start before the lifts officially open. The problem with any group lesson is, you're stuck with the preferences of the other N people in the group.
Or, as you alluded to - she gots to speak up! I may be belaboring the entirely wrong point here, and maybe there was a group that would have fit her interests. And obviously I'm typing at you, not her, which is kinda silly.
Okay, I have beaten my particular dead horse entirely too much. I'm sorry your gf (who I may have met - I met so many people!!) had a shitty experience over several days of lessons. No matter what, that is unfun and a waste of money.