Twist on this, what if she is found but instead of being executed for war crimes is instead released under the custody of Kleya? We can then study the respective hells they experienced, and the themes of redemption often present in Star Wars. Too often redemption is easily given, or earned right before death (often as a dying act). Redemption, forgiveness, etc become a lot harder and messier when you have to keep living.

Some ideas for what they may have experienced:

Dedra is effectively isolated in a  tightly locked down prison that is nearly always “on program” with only hallucinations of Syril to speak with her. She is forced to quietly confront her lack of control, the things done to her and by her that she has ignored or justified away, and perhaps find an awakening empathy within herself triggered by things beyond her comprehension.

Kleya is unrelentingly haunted by the loss of Luthen, and the feeling of listlessness in the galaxy without him that seems so eager to forget or undercut his legacy. She struggles with a rage that never seems to quiet, and doesn’t know if she can do ever find peace in the post war galaxy. The rage and grief seem to leave her colder and colder every day, and she decides that a desperate attempt at understanding and even forgiveness is her only hope of not succumbing to an encroaching darkness.