First round: Knight uses Giant's Gloves, Ninja attacks, Black Wizard casts Haste on Knight.
Second round: Knight attacks, Ninja uses Giant's Gloves, Black Wizard casts Haste on Ninja.

After that, Knight and Ninja both attack continuously while Black Wizard continuously casts Flare--either the normal way or with a Judgment Staff. All the while, White Wizard should be casting Invisira, Null All, Healaga, etc. Whatever seems appropriate. If no healing or protecting is needed, she should go ahead with Holy or, if you have a Judgment Staff, Flare. Chaos should go down in a couple turns.