Question: Which author, editor and socialite was the mother of Alma Manon Gropius?

Context articles: Alma Rosé
Mahler on the Couch
In Memory Of ... (ballet)
Henry Hill (architect)
Manon Gropius
De Mi Alma Latina
Alma Mahler
Manon Lescaut
Ati Gropius Johansen
Alma de Bretteville Spreckels

Alma Rosé's father was the violinist Arnold Rosé (né Rosenblum; 1863–1946) who was the leader of the Vienna Philharmonic Orchestra for 50 years: from 1881-1931 as well as leader of the Vienna State Opera orchestra and leader of the legendary Rosé String Quartet.
 Her mother, Justine (died 22 August 1938), was Gustav Mahler's sister.
 Alma was named for Alma Mahler.
Mahler on the Couch (German: Mahler auf der Couch ) is a 2010 German film directed by Percy Adlon and Felix Adlon.
 It is an historical drama depicting an affair between Alma Mahler and Walter Gropius, and the subsequent psychoanalysis of Mahler's husband Gustav Mahler by Sigmund Freud.
In Memory of ... is a ballet in one act made by New York City Ballet ballet master Jerome Robbins to Berg's "Violin Concerto (to the Memory of an Angel)" of 1935 (written on the death of Manon Gropius, daughter of Alma Mahler, Gustav Mahler's widow, and Walter Gropius), based on themes from Mahler, a Carpathian folk song, and Bach's "O Ewigkeit, du Donnerwort", BWV 20.
 The premiere took place on 13 June 1985 at the New York State Theater, Lincoln Center, with scenery by David Mitchell, costumes by Dain Marcus and lighting by Jennifer Tipton.
Henry Hill (1913–1984) was born in England to American parents.
 His mother was Anita Jeffress-Hill.
 His mother and her children moved back to the US and settled in Berkeley near the Claremont hotel.
 He studied architecture at the University of California, Berkeley graduating in 1936 and at Harvard's Graduate School of Design, where he worked under the renowned Walter Gropius.
 After earning his master's degree in architecture in 1938, he returned to the Bay Area, joining the office of John Ekin Dinwiddie in San Francisco and making partner in 1939.
 During World War II Hill served as a captain in the U.S. Army Corps of Engineers.
 When the war ended, he rejoined Dinwiddie and a new partner, Erich Mendelsohn, a well-known German architect who had fled the Third Reich.
Alma Manon Gropius (October 5, 1916 – April 22, 1935) was the daughter of the architect Walter Gropius and the composer and diarist Alma Mahler and the stepdaughter of the novelist and poet Franz Werfel.
 She is a "Randfigur" (peripheral person) whose importance lies in her key relationships to major figures: a muse who inspired the composer Alban Berg as well as Werfel and the Nobel Prize-winning writer Elias Canetti.
 Manon Gropius is most often cited as the "angel" and dedicatee of Berg's Violin Concerto (1935).
De Mi Alma Latina (also known as From My Latin Soul) is a 1994 Latin music album by Spanish tenor Plácido Domingo.
 It was nominated for a Grammy Award for Best Latin Pop Album of the year.
 Most of the tracks on the album are medleys of, in the words of one author, "some of the Latino world's most memorable melodies."
 The only new composition on the album, "De México a Buenos Aires", was written by Domingo's son Plácido Domingo Jr. All the songs are in Spanish, except for "Manhã de Carnaval" and "Aquarela do Brasil", which are in Portuguese.
 Domingo also used "De Mi Alma Latina" and "From My Latin Soul" as the names for some of his subsequent Latin music concerts.
 In 1997, he released a follow-up album entitled "De Mi Alma Latina 2".
Alma Maria Mahler Gropius Werfel (born Alma Margaretha Maria Schindler; 31 August 1879 – 11 December 1964) was a Viennese-born composer.
 author, editor and socialite.
 She became the wife, successively, of composer Gustav Mahler, architect Walter Gropius, and novelist Franz Werfel, as well as the consort of several other prominent men, notably painter Oskar Kokoschka.
 Musically active from her early years, she was the composer of at least seventeen songs for voice and piano.
 In later years her salon became part of the artistic scene, first in Vienna, then in Los Angeles and in New York.
Manon Lescaut ("L'Histoire du chevalier des Grieux et de Manon Lescaut") is a novel by French author Abbé Prévost.
 Published in 1731, it is the seventh and final volume of "Mémoires et aventures d'un homme de qualité" ("Memoirs and Adventures of a Man of Quality").
 It was controversial in its time and was banned in France upon publication.
 Despite this, it became very popular and pirated editions were widely distributed.
 In a subsequent 1753 edition, the Abbé Prévost toned down some scandalous details and injected more moralizing disclaimers.
Ati Gropius Johansen (1926 - September 7, 2014) was a graphic designer and teacher.
 She was the daughter of famous architect and Bauhaus founder Walter Gropius and his second wife Ilse (Ise) Frank.
 Johansen was born as Beate in Wiesbaden, Germany, and was adopted by Walter and Ise at 9 years old when her mother, Ise's sister, died.
 Johansen was instrumental in continuing the legacy of her father through her teaching.
Alma de Bretteville Spreckels (March 24, 1881 – August 7, 1968) was a wealthy socialite and philanthropist in San Francisco, California.
 She was known both as "Big Alma" (she was 6 ft tall) and "The Great Grandmother of San Francisco".
 Among her many accomplishments, she persuaded her first husband, sugar magnate Adolph B. Spreckels, to donate the California Palace of the Legion of Honor to the city of San Francisco.