[2][3] In 1907, at the age of 38, she married the artist Sigismund Goetze, whose sister Violet Goetze was married to her cousin Alfred Mond, and they purchased as their marital residence Grove House, a villa in Regent's Park built by Decimus Burton, at auction.
In 1907, in memory of her father, Constance made a substantial endowment to the British Academy to create a fund that would be "devoted to the furtherance of research in the archaeology, art, history, languages and literature of Ancient Civilisation, with reference to Biblical Study", which led to the first of the annual Schweich Lectures on Biblical Archaeology in 1908.
[7] Following the unexpected death of her husband in 1939, she made a bequest of a number of artworks and ten manuscripts from his estate to the Fitzwilliam Museum, including Ecce Homo by Guido Reni (painted in 1639).
Under her direction, the Constance Fund commissioned the Triton and Dryads fountain, designed by William McMillan in 1936, which was at last installed in Queen Mary's Gardens in 1950 with an inscription commemorating Goetze as a "Painter[,] Lover of the Arts and Benefactor of this Park".
The Constance Fund also commissioned the Diana in the Trees Fountain in Green Park, which was completed after her death and was presented to the Minister of Works by her niece Countess May Cippico.