I never sympathized Zira too much. Just saying she was remorseful about losing Nuka. That was part of the reason she hit Kovu. She knows losing Nuka was partly her fault, Like with Debbie Loomis knowing she have a part in her son's death, except she had to throw the blame on somebody. "What have i done?! I'm a bad mother. Wait! I was good mother! I didnt killed Nuka. It was Simba, and Kovu let him". Swich "Simba" with "Sidney" and "Kovu" with "Gale", and that's approximately what Debbie told herself.
Just explaining why i added her to the "remorseful" list. She was obviously remorseful about seeing Nuka, her own flesh and blood, being killed. And i gave Debbie Loomis, who was the main antagonist of Scream 2, as an example to a person who had similar considerations to what Zira had. Hope i made myself more clear.
Okay she was remorseful about her own son being killed, but when it comes to remorseful in regards to Villains wiki, the category "remorseful" applies to her evil deeds, and she clearly did not regret them.