Thanks! So Reddit it was. Usually not there.
Well, technically … it could still be that Sienna’s mind somehow gets transferred into Sofia’s body. She would look like Sienna, be named Sienna and have magic powers. 
And then we could discuss if magic in Warhammer is tied to the mind or the vessel the mind is in. Or the combination of both.
Nah, I will stay with my original guess: Maiden of the Blazing Sun
Just so that I can say I told ya! Well, chance is still there. We will know next year.