Same, i've never seen an orb in any attempt, only learned about them existing reading this and it explains why she resets to full health over and over but I can't unbug a server side game lol.

This *** pisses me off.

I learned about the orbs just reading that thread. Can't see any orb while fighting, I died 30 times before realising it's just as the quest is bugged for me.

While battling her on my latest character I noticed that the orbs weren't spawning(something I had thought they weren't doing in many cases with other characters) but then as I moved around her I saw an orb which seemed to appear out of a clipping situation. I moved to the back corners of her room, she stayed where I first saw her, rushing in to attack then dashing back to a corner. I saw the orbs spawn this time, rushed them, destroyed them, got her health way down then back to corners for me, orb spawns then destroy them and finish her off.

Loaded up another character which I hadn't been able to kill her with, used the corner scheme (changing corners to avoid her attacks) and killed her first time.

On a side note to the clipping, I have noticed a chest in another dungeon that clips in/out depending on where I stand. I run a Nvidia GTX 780 (open box, half price at local geek store otherwise I wouldn't have bought it) so I don't think my card is causing it.