Answer
The answer is "Hanna", a 2011 action-thriller film directed by Joe Wright. Saoirse Ronan plays the title role, a teenage girl raised in the wilderness by her father to be an assassin. The film follows Hanna as she travels to Europe to carry out her first assignment, while being pursued by a CIA agent and a ruthless mercenary. The film explores themes of identity, family, and the nature of violence.