There's a brief moment when I think I might manage to disarm her. The second her shield wears off, she needs to concentrate and take a deep breath to refresh it. It's definitely a vulnerability, but I notice it a little too late and thus don't get around to taking advantage of it. Instead, I make a mental note for a possible next encounter, and refocus on deflecting her spells. I clench my jaw because, slowly but surely, it's getting tiring.