She used this to fund a wide range of causes, notably a musical salon where her protégés included Debussy and Ravel, and numerous public health projects in Paris, where she lived most of her life.

Their daughter, Daisy Fellowes, was raised by Winnaretta after Isabelle-Blanche's death and became a noted socialite, magazine editor, and fashion trendsetter.

Winnaretta's younger brother, Paris Singer, was one of the architects and financiers of the resort of Palm Beach, Florida; he had a son by Isadora Duncan.

[2] Although known within private social circles to be a lesbian, Winnaretta married at the age of 22 to Prince Louis de Scey-Montbéliard (fr).

The marriage was annulled in 1892 by the Catholic church, five years after a wedding night that reportedly included the bride's climbing atop an armoire and threatening to kill the groom if he came near her.

[1][3] In 1893,[4][5][6] at the age of 28, she stepped companionably into an equally chaste marriage with the 59-year-old Prince Edmond de Polignac (1834–1901), a gay amateur composer.

[8] In the course of her life, Singer had affairs with numerous women, never making attempts to conceal them, and never going for any great length of time without a female lover.

"[10] Polignac had a relationship with painter Romaine Brooks, which had begun in 1905, and which effectively ended her affair with Olga de Meyer, who was married at the time and whose godfather (and purported biological father) was Edward VII.

[citation needed] In 1894, the Prince and Princesse de Polignac established a salon in Paris in the music room of their mansion on Avenue Henri-Martin.

The young Ravel dedicated his piano work, Pavane pour une infante défunte, to the Princesse de Polignac.

The plans of Le Corbusier's Salvation Army hostel in Paris show a private apartment at the top floor for "Miss Singer".

[citation needed] During the inter-war period, Singer-Polignac worked with Consuelo Vanderbilt Balsan and assisted in the construction of a 360-bed hospital destined to provide medical care to middle-class workers.