How is it she's a Kossith? Considering the word is so very unknown, would mean that the Kossith people would have likely died out sometime ago. The Codex even mentions the Kossith 'birthed' Ogres, meaning the only Kossith still living are probably Broodmothers. Not to mention -410 ancient is almost a thousand years ago, if I remember the Dragon age timeline correctly.
Not trying to discourage you from this path or anything, just trying to make sense of it all.