Mostly, I am all about forgiveness. Even when watching Gintama, when villains' pasta were revealed and Gintoki forgave some, I was content and agreed with him.
But this bitch doesn't deserve any forgiveness. She's not only a sis-con, but psychopathically obsessed with her older sister. She killed her sister, her sister's lover, destroyed a whole city killing many other, killed her father, and ruled like a tyrant. She got fortunate that Ain/Akutsu didn't go back to the Angel Kingdom or else there would have been a large scale war between both the factions possible wiping out everything. In my opinion, she doesn't deserve any sympathy or forgiveness because she did all this due to no reason.