She'd do that if you were her student,

[Anders says a little grumpily. Wynne had apparently been the best mage friend to have while traveling, but Maker forbid any other mage get to be out of the Circle. It annoys him sometimes that everyone who traveled with her and Jonas seemed to love her.]

Teren's not as bad as you think. You just piss her off because she doesn't appreciate fart jokes and smells with personality.