The Cowl of the Guiltless drops from the last boss in the Black Morass.
The Mantle of the Unforgiven drops off the last boss in Mana Tombs (Heroic).
The Chest, Legs, Gloves, and Boots are all random BoE drops from Outland best found on the AH or through luck.
The belt is the Liar's Cord from the second boss in Slave Pen's (Heroic).
The Winterwater Cloak from a Winterspring quest completes the look.
I hope she likes the touch ups I did to her outfit.