I agree she's so well written and it really portrayed how, IMO, when you cannot accept the pain and can't understand how someone you so trusted and love, betray you so brutally and so easily, can turn you into your worst insidious self. She had no one to turn to when she woke up after losing everything. She needed a way to cope with the hurt, she needed no justification because for her, nothing could be justified hurting her that way. In the end, in either timeline Anita always loses. Even after she destroyed the empire, she still is hurt and bleeding. For Anita, it a losing game from the start, she's just trying to rationalize it and it ended up this way.
I feel like her time of rage has passed, the king died there's nothing she can do for revenge. She's blaming people who haven't done anything to her, and that's where her rage is wrong and unjustified. Carrying the blood of a bad ancestor doesn't make you bad, and she should've realized this. But blinded by rage she can only hope to hurt them because they resemble the old emperor.
Anita as a character is so well written that her rage is justified, I feel bad cus at the end of the day, she will die no matter what even if Regina forgives her she will die a pitiful long way. Atleast if Regina kills her she will rest but she might still carry hate. Very well written it's why some villain's are my favorite, they are more human like than the same heros or protagonists while others are straight up monsters horribly written