I dont know specific names of the zone, but we fought our way into the castle there is room with 2 stair cases on either side of it, and a hallway down the middle of it, go down the hallway make a left and in the room is i think where we found her. She is one groupable, did it with cleric, paladin, rogue, shaman, bard, and chanter. YOU MUST becarefull with her, you will get about 5-6 adds at least when you pull. If possible mez her (which we didnt do) and deal with adds first as one of them will CH her, and she has a decent amount of HP to begin with. She IS undead so pal/nec/cle/shd let loose with undead nukes. We did kill her however were unable to deal with adds afterwards because our mana was low from fight, and did infact wipe. She only dropped the Spectral Gauntlets of Might for us.