It's more than that, though, because sometimes she says thinks that are just plain dumb. Like her view on not helping Teagan - there's clearly a huge upside for anyone interested in self advancement there, i.e., being owed a favour from, if Eamon is dead, one of the most powerful lords in the realm. And from a pragmatic POV, if Eamon is dead, then Teagan has to absolutely survive as Arl of Redcliffe (the alternative being Teagan's young son, who wouldn't be fit to rally anyone against Loghain).
Nah it's not misguided it's straight up stupidity. Redcliffe is a prime example. You gain nothing by leaving everyone to fend for themselves. (It just makes your job harder) the smartest (if a bit cold) thing to do in that situation would be to use the redcliffe villagers as meatshields. Not allow them to be used against you.
I don't think leaving the villagers to fend for themselves is dumb at all. Cold and ruthless, sure, but game-logic aside willingly putting yourself and your team (aka the only surviving Grey Wardens around who could possibly end the Blight and thus save countless other lives) in harm's way in a non-Blight-related issue for a single village is way too risky. Same with the Circle, actually. I think people are way too comfortable with the goody-two-shoes playthroughs in RPGs nowadays because the meta formed them to be tehnically superior to any other way, and DA is no exception (I hear that the Witcher kind of is, but I'm not too familiar with that one). They would think twice about it if a random one of your party members dies in a cutscene during the battle against the undead, which is entirely possible from a roleplaying standpoint.
At the point of speaking to Teagan about helping Redcliffe out no one actually knows the exact mechanics of the undead attacks. It is just described as some bloody mess that may or may not be related to the Arl's condition. "Using the villagers as meatshields" is not much an option at that moment, and again from a roleplaying standpoint why would they want to do that if they could just simply wait out the night and leave the castle when the undead already receded?
While RPGing I prefer to think big. Yes, the villagers are people, they are suffering, they are not at fault for the massacre they have to face and have no hope of fighting it alone yadda yadda. But all this is a minuscule issue compared to the Blight, which we are technically the best people to end, therefore our little team indeed holds bigger value than a village of a few hundred peasants, Teagan puppy eyes or no. I don't fault either Sten or Morrigan for what they are saying to Teagan. In that situation, in their shoes, without game meta knowledge, I would probably say the same thing and I don't think I would be evil for that. It's not what I did in my canon playthrough, I reluctantly helped, but only because of meta.
About Eamon's legacy and Redcliffe's rulership, yes it's a risk to ignore Redcliffe's plight and go straight for an Arl that may not be alive and risking the next-in-line's life at the same time, leaving only Connor who would indeed not be fit to oppose Loghain. But as I said risking your entire team's hide in a battle that might kill us all, Teagan included for all we know isn't objectively better at all.
Let's see the "ignore Redcliffe's plight" scenarios for a bit (this does not include later info about Connor, the Demon, the Sacred Ashes and whatnot):
We find Eamon alive, Teagan dies in battle -> we have an Arl who will most likely help us if cured, regardless of what we did with the village (we don't have to be friends for Eamon to hate Loghain)
We find Eamon dead, but Teagan survived the battle -> we have a new Arl who hates our guts, but would stand up agiainst Loghain nevertheless if he has any brains (again, we don't have to be friends for Teagan to accept the direness of the Loghain situation)
We find Eamon dead, and Teagan also dies -> we're screwed, we get no Landsmeet
The odds are against Teagan here. Note that alternatively the last scenario could be replaced with "our team perishes, even if there's a Landsmeet it's pointless".
Then she spends the whole game antagonizing who she needs for the DR (especially facepalm worthy if your pc is a female). But prides herself on manipulation? Her ridiculousness in DAO continues to baffle me.
Offering a way around death is a tempting enough offer even for a non-friend, from her point of view. I don't think she even calculates with the possibility of the Warden willingly choosing the US (which is regardless of a friends-with-her state btw), for she doesn't understand the concept of sacrifice due to her upbringing (which again, I don't count as stupidity, just naiveté and inexperience with the world). She also couldn't calculate with Loghain, as in someone who the Warden would happily toss to the AD and he would even love it. I don't think it could have been foreseen by anyone. As for Alistair, he does whatever the Warden tells him to do and Morrigan knows this since Lothering, pretty much. His grievances don't matter for a second.
As you can see in this thread among many others no doubt, she wasn't entirely off the bat.