Acclaimed Spanish director Pilar Palomero just released the sharply authentic story about Carla, a 14-year-old facing an unexpected pregnancy. A tough, unsweetened work of social realism built around an astonishing screen debut by Carla Quílez. “La Maternal” is soundtracked by C. Tangana, Estopa, La Pili, and an original cover of La Húngara.