Potency on the cross for AoE daze. As much +speed secondary and as much + (#/%) health as you can gather. Her stacking max protection is based off her health so have it as high as possible.
Advanced mode recommends 4x speed and 2x potency. The bonus from a potency set is only +15%. If you throw a health pair on instead but make sure you have +24% on the cross you'll maximize her protection unique.
However, you could do potency pair plus potency cross for +39% too...