The Darren Aronofsky psychological horror movie 'Mother!' is about as high-brow as horror films get. It has an art-house style, and is so unconventional in its approach that none of the characters even have names. They're just known by the roles they play, and in the case of Jennifer Lawrence, that role was 'mother.' Perhaps because she was keen to display her range as a performer, she took the part in the hope that it would show her in a new light. For a while after making the movie, she regretted it.
Although she now says that she's coming to terms with the film, having had more time to think about it, her initial reaction was that she, the director, and the producers had gone 'too far' in the process of putting it together, and that the level of horror was too high. She described herself as 'shaken' after seeing the final cut.