She was educated at the Priory School at Arundel and the Convent of the Sacred Heart, Woldingham.
From 1970 to 1979 she lived at Everingham in the East Riding of Yorkshire, where she was Master of Foxhounds for the Middleton Hunt, before returning to the Arundel area.
[1] Herries operated as a racehorse trainer[2][3] for over thirty years from the Angmering Park estate,[1] on the South Downs, near Arundel, Sussex.
The most notable horse she trained was the Racing Post Trophy and Prix du Jockey Club winner Celtic Swing, who was crowned the champion two-year-old of 1994.
[4] The dukedom and her father's other titles passed to his heir male, Miles Fitzalan-Howard.