She can be found in the Telvanni Council House in Sadrith Mora.
The Nerevarine, having joined House Telvanni, will be able to begin a pair of quests from Raven Omayn in Sadrith Mora. Her first task for the Nerevarine is to obtain some muck, five pieces from where ever they can.
Once the Nerevarine has obtained five pieces of Muck for Raven Omayn, she will task them with another quest. The Nerevarine must obtain for her the Black Jinx, (a ring) although she does not know whom is currently in possession of the ring, or indeed where it is held.