Jennifer Lawrence struggled to separate her character from real life. The actress, 34, plays Grace, a mother battling to maintain her sanity while dealing with psychosis after postpartum depression in the upcoming thriller “Die, My Love,” alongside Robert Pattinson, who stars as her husband, Jackson.

The moment it crystalizes that Jennifer Lawrence is giving the most surprising, uninhibited performance of her career — the likes of which even her diehards might not have guessed she could deliver — comes quite early in Lynne Ramsay’s absolutely punk-rock trip through one woman’s psyche,