Killed her yesterday with 75 War, Clr, Shm, Wiz, Mnk and 74 Mage. Warrior was 15k hps and 2.5k AC fully defensive aa's. She wasn't very tough once War popped his defensive disc.
Head to the north through the hallway with the steel beams and the mobs on each side. You just need to clear the left side, the other side shouldn't aggro, and when you get to the T at the end of the hallway take the door to your left and clear all the way down that tunnel to the room at the end. She spawns in a casket in the middle of the room, PH is "a Elddar spirit". She dropped the monk ring for us.