She should have waited until she had finished preparations for the inevitable war that she was inciting. By rebelling, she basically turned every single mage in Theda's into public enemy number one with a giant red target on their backs saying "Templars strike here." They had nowhere to go, they had no idea of how to live outside of the circle, and they had no way of surviving. By forcing the vote to rebel multule times, she threw every mage to the wolves without any regard for their lives because she couldn't be bothered to think of how to prepare for what she brings upon them. She is a failure of a leader to such a degree that it makes my blood boil that anyone can even try to defend her.
She picked a fight with a group of people who have been trained for years to counter her forces. The only comparison that I can think of is the mages are rebels with hand guns and she picked a fight with a tank division that was already in the field.
Okay, this is ridiculous since the Mages kind of won the war.
It's a miserable UNNECESSARY war but the Templars were at the negotiating table.
Which is all they needed in the first place.
The only truly sad thing about it all is the war was probably "won" when Cole assassinated Lambert.
Lambert was pushing to disband the Mage's government completely, a Circle was just annulled for sketchy reasons (which were not shared with the College of Enchanters), and First Enchanters had just been killed. It was Lambert's intention to eliminate the parity which had existed between the Enchanters and Templars and make the former subordinate to the latter.
THAT'S what prompted the war. People who think the war was inevitable or that Fiona is at fault miss the fact it very much was something which could have been avoided and there was a lot of room to compromise on, especially once Lambert was dead.