What could she have done?
Many things. Don't let it happen in the first place, get rid of it, escape, and so on. What she did was seat on her ass and wait for 9 months. She gave up both physicaly and psychologically long before it happened and it reminds me of Fenris and the fog warriors. And I can't have even the slightest bit of respect for her in that matter.
This was a particularly powerful demon and Wynne understands that anyone (even her) is at risk of being posessed. She's also a spirit healer and someone who naturally communes with the entities in the fade. Those people are in even more danger than regular mages, she did pretty well against every other demon but she was in this demons realm and he was very powerful.
That was not what I meant. I mean - how the hell she can teach someone about something she has no idea of? Morrigan, whom Wynne view as arrogant, naive and dangerous did a waaay better. Because she has experience with such things, she's not afraid of them. I bet she would've done much better teaching someone but people like Wynne will never understand nor acknowledge that. Their own knowledge is limited by circle's experience, it's teachings, they're full of chantry's prejudice. They had no idea how to help Feynriel, for example, what about that? All because they're nothing more than the templars slaves and afraid of their own shadow.
everyone nags at Morrigan.
True, but she has an arrogance to think she knows better. About magic. Better than Morrigan and Flemeth. I'd say, she deserves a punch or two for that.
Someone so weak and close minded shouldn't talk, really.
Wynne doesn't allow the spirit to warp her mind
Ha, that's not because of her but mostly because of a spirit's personality.
and she herself was not just perfectly happy to be an abomination
How convenient it is - to preach something you yourself don't believe in, then. She speaks of how dangerous both abominations and possesed people could be, how it's for mages own safety to keep them under the watchful eyes of the templars but in the same time she makes an exception for herself. Like, "oh, yes, I'm not feeling like I'm gonna kill you, nothing to worry about. Trust me, I know better". Nothing to respect here either. Were the circumstances a little bit different, she may have ended up just like Anders, or worse. That's the point. People make exception only to themselves and their friends, family, ect. And their beliefes suddenly goes puff - into the thin air. When it really matters.
I really don't see the point in arguing but that's just how I see her. And nothing can change my mind here.