PoF spoilers follow:
So what game is the goddess of illusion is playing this time? There are few instances which indicate that she might have been in league (at least to an extend) with Balthazaar.
1) His acquisition of Mirror of Lyssa has not been explained, and is stated as being the primary reason for Balthazaar's ability to escape the note of the other gods until his plans moved too far. ("When he returned to this world, Balthazar disguised himself as Lazarus with Lyssa's Mirror—the only magic powerful enough to hide the truth from our eyes.")
2) During the conversation with Kormir, she states that "The rest of the Six—Dwayna, Grenth, Melandru, even Lyssa—reached an agreement. Balthazar had to be dealt with." Even Lyssa. She appears to have been the least likely (at least to Kormir) to join the pact.
3) Finally during his final moments Balthazaar states "Curse you, Dwayna! Melandru! Betraying one of your own! Grenth! Kormir! May the fires...take...you...all!" Lyssa's name is conspicuously absent.
So where does that leave the goddess worshiped by deceivers? Is she playing both sides of the conflict? Does she have her own motives?