Everybody Wants to Rule the World Except Me (Dark Lord Davi, #2) by Django Wexler

Dark Lord Davi rules the kingdom, but she must now break the time loop that binds her in this hilariously bloody conclusion to the Dark Lord Davi duology.
 
After countless failures (let’s not dwell on it), Davi has finally saved the kingdom from evil–by becoming the Dark Lord herself. But now, the hordes of wilders are at her command, and they still want blood. Human blood. And Davi’s not sure she can commit to the total extermination of humanity.  
 
With restless armies at her doorstep, a treasonous duke scheming for power, and the legend of an ancient magician looming over her shoulder, Davi must find a way towards peace and uncover the truth behind her time loop if she is to bring harmony to the kingdom. Also, her girlfriend is mad at her. So, there’s that too.