Maybe she will end up as a girl who takes her role too seriouss and will soon filled with selfdoubt about her task and she will think in the end, that her involvement made it even more worse for everyone. You could consider this kind of person as a Angsty Sue.

Oh one thing... I know how she will end up as Master Sword permantly. She will do the same like Raziel of the Soul Reaver Series for Kain.
http://www.youtube.com/watch?v=KEQVU...eature=related
Look at 5:20 .

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These worlds...
They may differently look, but, after all, they carry the same sins, even on unintentional doings. My heart hurts it over and over again that the history recurs.