Her name was Lucy and she was a pioneer in women's education who received an honorary LL.D. in 1904 from the University of Leeds. The Lucy Cavendish College of the University of Cambridge is named after her. Her Wikipedia article is here.
From bbc.co.
Lady Cavendish looks back wearing relaxed dress with a fur-trimmed wrap in this Watts portrait from about 1850.
Keywords: 1850, Watts - George Frederick, Lyttelton family, Cavendish Bentick family, British, straight coiffure, bertha, lace, full skirt, necklace, bracelets, wrap, fur, lining