From raws side stories and novel spoilers. She was sent to monastery at the end.
I copy and paste "She decided to present a fake lost relative of the imperial family and when she was found out, she was sent to the dungeons. She was sure she would be beheaded, but coincidently, Edith found the real one and as a prize, asked the emperor to release lize and to not hold a grudge against the Ludwig family. The emperor agreed but with the condition that Lize is sent to a monastery and lose her status as Cliff's wife.(She made a clause in the marriage contract that he could never ask the divorce,but the emperor can do it)".
Cliff remarry another woman with brown hair, I believe she is not a nobel, not a rich, not a beauty either.
I AM DISAPPOINTED ABOUT THE ENDING IN THE NOVEL (although I am happy that Killian and Edith got to live happily ever after) BUT CLIFF AND REEZE?!! She should've paid for her crimes! (killing 12 ladies and attempted to kill Edith too) But noooooo- instead we got Cliff and Reeze getting married ರ╭╮ರ