Originally Posted by Havince
what do i have to do ? she dodges my shield everytime
You have to reflect her bullets back to her. If you simply block usng LB you won't hit her. Watch for the two white marks meeting in the middle. If you hit LB at the right time, it will reflecf the bullet back to herself.
You'll know you've done it when the screen goes slightly slow and she falls onto one knee. I should have a vid uploaded later if you are still stuck.