One of her five favorite books with female protagonists who shoot first and ask questions later, as shared at Tor.com:
June Iparis (The Legend Series by Marie Lu)Read about the other entries on the list.
Not only is June a genius—she scored the highest marks on her Trial, a test that designates where in society you end up. After her only brother and caretaker is murdered, June vows vengeance, desperate to track down the person responsible. She is cunning and logical, and ruthless in her pursuit of the person who took her brother from her. Just look at June’s mindset: “I will hunt you down. I will scour the streets of Los Angeles for you. Search every street in the Republic if I have to. I will trick you and deceive you, lie, cheat and steal to find you, tempt you out of your hiding place, and chase you until you have nowhere else to run. I make you this promise: your life is mine.”