Sorry y'all, I may have butchered some of Annie's dialogue in the battle scene. I just re-edited it to be a bit closer to the raws, but anyways the gist of it is:
[ul]
[li]Her skillset is that of an assassin.[/li]
[li]Her fighting style revolves around this sword "engraved in her mind (or head)".[/li]
[li]She has this freakish belief that she literally 'will not' or 'does not' die ("죽지 않아").[/li]
[/ul]
Even now, I'm still skeptical of my interpretation in that second bullet point since the raws literally had:
"In the Hidden Blade, there are not these two swords which charge to the front // There's only .... this sword engraved in my head"
( "정면으로 돌진하는 2검술은 암검에는 없다. / / 단지 .... 내 머리에 새겨져있는 이검" )
where 'engraved' and 'head' could be in the literal sense or they could mean 'remembered' and 'mind', respectively.