The first time I tried the hag fight, I got utterly trounced. It was several patches back and I was clearly losing in the first couple turns with no way to stop the fire. I reloaded and just left. The next time I tried it, I used advice from the forum to just kill her quick before she made it into her lair. The first time after that when I went into her actual lair to fight her, I shoved one of her illusions into the pit and I was lucky enough that it was the real thing. I've never actually enjoyed the fight or really the hag stuff as a whole. That stretch after the masks with all the flame traps? I hate that, it's so tedious and frustrating. The movement mechanics make it so much worse than it already is because it's so much easier to set off any of the traps even if you see a way to avoid them, and if you actually do set off the traps, disarming them is such a pain, if you even can disarm them in the face of the flame traps. I usually just end up powering through some section and use healing potions because the alternative is so boring and tedious. I do not like the hag encounter and much prefer just killing her in the tea shop, even though that requires annoying cheesing and save scumming too.
