I don't think her attacks changed.
Prior to the battle summon any undead warriors or spiders that you can as they are immune to poison. Since your slowed, it will take about two rounds for you to summon these initially. Ice and fire elementals died too quickly for me. If you notice her focusing her melee attacks on one character, fortify that one character.
Biggset thing is that you want to focus on poison resist. You also want to avoid fire at all costs as it will hurt you far more then it will hurt her. It also makes her and her spawns invisible with all the smoke. If fire becomes present, use rain. Sometimes I've had to use two characters making it rain to remove all the fire. While it is raining, you might be able to freeze her. She makes lots of blood spill on the ground so be careful with any lighting spells you use.
For the red spiderlings, either kill them before they get anywhere near areas with poison on the ground or use teleport and have them explode far away. I had them all die in one hit. Two of my characters have the teleport spell which helped.
I wasn't able to get her stunned, but was able to get her frozen. If you can actually freeze her, then focus on healing for that round.
Save your game right before she dies. On your killing blow, she should drop at least one or two rare (orange) items. If she drops all green labled items, you should reload the game. You'll miss out on stuff valued over 10k gold.
Good luck killing her.
Last edited by LightningLockey; 26/09/14 08:31 AM.