The Rosenbach has more than one Hoffman sculpture, there is another of author John Keats in terra cotta in the library. Hoffman was a prolific artist, the Chicago Field Museum alone has over 100 of her sculptures. The majority of her work is in bronze, plaster, terra cotta, or marble, with the exception of this bust of Rita Lydig and one of Sri Ramakrishna which are both in alabaster.
Alabaster bust of Sri Ramakrishna
Impressed by Rita's innate creative spirit, Isabella Stewart Gardner, the great collector and creator of the Isabella Stewart Gardner Museum in Boston, once asked their mutual friend, John Singer Sargent, why Rita had never expressed herself artistically. "Why should she?" Sargent answered, "She herself is art."
Rita de Costa Lydig's younger sister Mercedes de Acosta gave the Metropolitan Museum of Art many of her sister's fine collection of clothing including several pairs of her custom made shoes.
Leather-silk-and-lace pumps by Yantorny for Rita Lydig, 1914—1919. Image from the Metropolitan Museum of Art.
For more on the "Shoe Queen" see here:
Edwardian Promenade » Blog Archive » The Shoe Queen: Rita Lydig
Which also reminds me of another shoe queen: