The Countess was the elder daughter and co-heir of Col. the Hon. Charles Henry Maynard, son of the 3rd and last Viscount Maynard [1786-1865]. Called Daisy by family and friends, she was known as a Court beauty, friend of King Edward VII, and active philanthropist. "Lady Warwick, converted to socialism in 1895 as a result of an extravagant ball held at Warwick Castle, stood as Labour Candidate in 1923, but was defeated by her son-in-law" (see Kenworthy-Brown et al.,). She wished to make one of the Maynard family estates, Easton Lodge, into an international Labour University. She married Francis Richard Charles Guy Greville, 5th Earl of Warwick, in 1881; they had three sons and two daughters.
Kenworthy-Brown, John, et al. Burke's and Savills Guide to Country Houses. Vol. 3: East Anglia. London, 1981: 50.