defend untill she starts to trip, then cast paralyze (or hypno if you cant get paralyze) . you now have around 6 turns of free actions. When she is out of the spell, repeat the same - always defend until she gets to around 2 points of stability and paralyze/hypno. If you are a warrior type, make sure to use armor crush until you break it. If you are a mage character, use oil before fire to ignore most of her magic resist. But never ultra fire - its entirely inefficient mana-to-damage wise and wastes more turns to enter the casting state.