@Demo This doesn't give her plausible deniability, if anything she would be guilty by association. But her being unaware that city is on fire because of them is highly unlikely for many reasons.
1: She made no attempt to rescue anyone, whatsoever.
2: She openly attacks another hero after this.
3: She admits that what the kingdom does, is for the best of the people.
She was 100% aware, apart of it, and believed it was necessary in order to defeat the Devourer.