I am again reading Marianne Thornton: A Domestic Biography 1797-1887 by E. M. Forster (1956) and recommend it to anyone wanting to better understand the circle Frances Rolleston moved in.
E. M. Forster (writer of A Passage to India) based his book on family papers, which is why it gives such a good insider look at Marianne Thornton's life. Some of the materials were prepared for Forster by Marianne Thornton in her old age; she was his great aunt.
Marianne Thornton and Frances Rolleston were cousins through their mothers. The house and its guests were familiar to Frances. The biography gives many intimate views of William Wilberforce, Hannah More, Henry Thornton, and others of the "Clapham Sect" Frances associated with. I'm only disappointed that she is not mentioned in the book, but then, she was only one of many in that circle.