[9] The marriage gave Cornelia a $75,000 a year allowance,[1] and bought the Earl property in Mayfair and paid for the renovation of Coombe Abbey, his family estate in Warwickshire which got a new roof, structural repairs, and its first electric lights.

Together, Cornelia and William were the parents of one child, a son and heir born in 1897: On July 10, 1921, whilst racing at Cowes Week, Lord Craven fell overboard and drowned at age 52, with his body washing ashore two days later.

[2][3] At Hamstead Marshall, Cornelia often hosted Princess Marie-Louise, a granddaughter of Queen Victoria, who divorced her husband Prince Aribert in 1900 at age 28, and never remarried.

[14] After her death, she bequeathed Prince Charles Louis, Count Palatine, by Anthony van Dyck, c. 1637, to the National Portrait Gallery.

[16] During the 2014-2015 exhibition at London's National Portrait Gallery, Cornelia was featured among the high-profile American heiresses to marry into British aristocracy.