The Undead Woman can be found wandering the halls of the caverns in the Temple of Hyath. She is in possession of the Hyath Leather Armor.
Note: Despite the [Undead Woman] being, well, undead, she doesn't have the template for such and is treated as any living creature enginewise. This goes for the other [undead slaves] in the area too, the only 'real' undead being the [undead janitor] wandering the hall.