She was born Mary Tracy, a daughter of Sir John Tracy (died 1591) of Toddington, Gloucestershire and his wife Anne, a daughter of Thomas Throckmorton (died 1568).
[1] Her brother Sir Thomas Tracy was a member of the household of Anne of Denmark, as an usher of her privy chamber.
In October or November 1607, she married the veteran soldier Horace Vere.
She wrote "God will provide" at the front of most of the books in her closet.
[6] At the death of the widow of Lord Vere's eldest brother, John Vere, she inherited Kirby Hall, where she died on Christmas Eve 1671, aged 90.