Pro tip for this Character:
Be very mindfull of which subjob you have equipped.
While in Sorceress you have access to Foul, the AI will inflict friendly fire or miss targets due to cast time 100% of the time in certain stages, not to mention using it to hit only one enemy. it is however good for certain stages as it speeds up farming considerably.
As many people have said, White mage is good for manual mode only since the AI will not use her skills.
Green Mage has Ruin which is M dmg modifier and non elemental so that's what I roll with most of the time.
Final tip, do not forget to level up the Enochian passive skill to raise MAG