I'm gonna give it a go 
Empress of fire, (Andraste who was burned in fire)
In the reign of the lion, (Celene)
Eclipsed in the eye of
The empire of we Orlesians. (Orlais where the Grand Chantry is Located)
Empress of fire,
What season may come,
We fight for the day
You'll restore our heart
And bring us to glory. (The whole phrase is akin to Salvation in biblical term)
We are forever (Followers of the Chantry)
In your graces. (Andraste as the Divine Figure of the Chantry in the Maker's Name)
Empress of fire,
Save us, everyone. (Andraste as the Savior Prophetess)
The nation reviles,
The course is but run, and end has begun. (possibly referring to the burning of the alienage and the events that followed after its wake, with the rifts opening -- end of the world and all that)
Empress of fire,
Believe in us all. (Biblical Term)
Embrace us with arms, (Faith and Shield)
And dress us with swords, (Sword)
And light up our hearts with blood so bold. (Sword, Shield, Faith and Fire, Iconic Symbols of Andraste she used all of this to fight the Imperium and conque the south)
Meh, just a theory though 