Board Thread:Speculation House/@comment-6500074-20130310094020/@comment-7472785-20130406085102

In the very first close up of her face (at 0:16) the scar seems visible already as a faded shade (as is normal for a healed scar). And in the closing close-up it is also visible as such.

Now whether she got the scar in the battle with the giant armour, or whether it's a trait of her that the scar turns red 'in the heat of the combat' may still be open to debate.