[3] Before World War I broke out in 1914, Lady Lucas had trained as a nurse and then went on to take over setting up and running her family home, Wrest Park, as a hospital for wounded soldiers.
She donated this collection to the British Museum in memory of her brother, who had died of wounds suffered as a fighter pilot during World War I.
[5][1] She kept another collection including items on the history of printmaking, mezzotints and stipples, which (along with the contents of Wrest Park) was later sold at auction.
[6] In the early 1920s, Lady Lucas also donated a significant collection of fossils, largely from the Isle of Wight, to the Natural History Museum.
[7] She succeeded to the titles of her brother, Auberon Thomas Herbert, becoming 10th Baroness Lucas and 6th Lady Dingwall, in 1916, and, on 30 April 1917, she married Lt-Col Howard Lister Cooper.