It actually wasnt that bad for me, just go around with hit and run tactics using the whipfist, run from building to building around her and use the fully charged stabbing attack with it in mid air on the three tentecles, then when she falls over stunned, switch to the sword arm and do the diving slash on her head as many times as possible. rinse, repeat, stay the fuck out of her reach when she even looks like shes goin nova on your ass and last of all, when low on health run to one of the taller buildings in the area and just wait there, a few hunters will come by, kill em, absorb em, then go kick ass, oh and use the buildings to block her ranged attacks if your having trouble dodging the rocks green energy homing orb things of death.... yes you can tell those things pissed me off for a time.