Regretful Regressor

When the Haven Realm was left bare without life only 2 people remained - given the chance to return to the past She went back to before the apocalypse and tried to eliminate anything that she regretted, moving towards a better future for the worlds and her self ... This story's mid and it basically has the regular regressor trope, i just thought it would be kinda cool to try and write my own regression story and how i would prefer my character to move through her new reality