She had a working relationship with composer Sergei Rachmaninoff during the 1910s, and he composed a cycle of six romantic songs dedicated to her (opus 38). Rachmaninoff also played piano accompaniment for Nina Koshetz who preferred a Blüthner piano for its mellower, softer tone.
Nina's daughter Marina Koshetz (also known as Marina Schubert) (1912–2001) was a soprano opera singer who appeared with the San Francisco Opera as well as the Metropolitan Opera, New York. She sang in films and wrote a biography of her mother and a screenplay about Nina's love affair with Rachmaninoff both titled The Last Love Song.