Start by fighting as if in a normal battle. Then, climb up the ladder when she cannot move. Next, blow up the four generators. You do not fight her here. Then, rip open the gate and jump down. It gets difficult at this point. Run around until you find the key. Then, go up to her, but not too close. Kick her; do not stab or punch her or you will get hit. Then, only hit the pole in front of her when she shoots electric waves. In between the waves, kick her, but do not get too close. While she is on the ground, a pole will have electricity on it. Stab it and the electricity will transfer to another pole, and so on. Do this until the door opens. Go up the stairs, then Lady Deathstrike will jump up. Kick her until she falls off the left side. She will die.