It wouldn't be a lie to say Julia didn't regret her actions from before. She couldn't deny that she was at fault for her part in Cain's fall into the abyss. In her fear for her life after trying to avoid taking responsibility for her actions, she had essentially sold her body to a man who did not have her best interests at heart.
Now with the actions of Felix and her own growing fear for her future, something dawned in her. It was like an epiphany or a moment of clarity before her impending death. Her trembling stopped as Paigos and Felix began speaking more in detail about the plan to crush Cain and anyone who stood by his side. Her entire mindset had changed.
If she was fated to die... She would want to die doing the right thing. She would be a betrayer one final time. She knew it wouldn't make things right but she still had to try.
