Clayton Davis Olivia Colman plays Leda in “The Lost Daughter” like a consummate pro, and her portrayal of a college professor on holiday in Greece, who reveals herself to be “an unnatural mother,” is among the most critically acclaimed performances of the year. With a deceivingly open and unpredictable best actress race ahead of us, the Oscar-winner who surprised awards watchers by defeating Glenn Close could add her second lead statuette to her mantle for her complex portrayal.This year’s race for best actress has taken twists and turns.