People still think that Fiona was brainwashed or confused?
Andraste's holy knickers, she and all her lovely mages were given refuge in Ferelden's most prosperous town, in their impregnable (Why do I imagine pregnant castles when I say that?) castle that even withstood the fifth blight where others fell. (or I'm thinking of another town right now but iirc Redcliffe is the only Fereldan town with proper codex entries) Nobody with a reasonable amount of intelligence would assume that Ferelden hated them and templars were going to overrun them. If it weren't for Ferelden's support, they'd be running away from templars in the Korcari Wilds or some other backwater hostile place.
Even if the time magic has effed up her brain, last time I checked she wasn't blind and could see that she was able to safely sleep in Redcliffe even though she started the war, while innocent refugees are struggling to survive in the Hinterlands.
And even when the mages had shelter, food, water and protection, Fiona decided that the best idea was to ally (*ahem* sell *ahem*) the mages to Tevinter? The country that entire southern Thedas despises? Even the qunari are at war with them. Their leaders, the magisters are even seen as the very reason why the Blights started. How could a Grey Warden who, possibly believes the Maker and that story, consciously ally themselves with Tevinter?
Heck, one could even argue she knows how dangerous Tevinter magisters are because she could've assumed the Architect was one and Corypheus was one as well. Granted, this is speculation, but it wouldn't require rocket science to connect the dots and it could've passed through her mind at one point.
I'm sorry, I've tried to appreciate Fiona, but she made some really dumb decisions because her mind was clouded with DUHR HUR freedom. She's pretty much Loghain 2.0, in the past a good and respectable person, but ending up terrible due to extremely biased stupid decisions.