If you get stuck on her try using Black Knife Tiche.
Still don't have that guy. I have Luthel at +10 too, was gonna try to use him but I screwed up and got megaraped in the first 20 seconds and I had to head to the store lol.
I've tried cheesing her (yeah sue me) and I can get her to her 2nd phase with nearly 0 hit perfection (not counting 100% blocked stupid-attacks) but the 2nd phase, even with said cheese can still one-shot yo azz.
The cheese I'm using is jumping onto that branch behind her, you gotta walk really slow up this branch but somehow it glitches out and you shoot up real quick but juuuust shy of the needed height to land on the branch. So right after you shoot up into the air you cast Agheel's Flame and it lifts you just enough to land on it. Then you just spam swarm-o-flies. But the landing is buggy. If you try to jump out of the way for her attack to miss, you get stuck in a falling animation for about 20 seconds and then you die. Kinda shitty.
But I just wanna get past her.
Also, I unlocked the shortcut elevator reeeeeally early in the level when you get down to the city, lol. You have to get in the left/bottom corner of the elevator shaft, and just fall to your death. You will die, but your body will hit the trigger and unlock the lift lol. I did it, but didn't go down the lift, I wanted to see what else there was.
I got pretty far, to one grace away from the grace right at her door. Then I tried the lift to see where that led and it led right where I was lol. Pointless but cool.