I believe she will Job Change. She is the Only Scion now who hasn't had a Job Change (I guess unless you count Estinien. But I guess Ill say Archon)
And maybe she will be the Showcase for the New Job, like how Thancred was a Gunbreaker, alphinaud is a Sage, and alisaie was a Redmage.
And she seems like a Mage, so it would be a Magical DPS.