She came from the Catholic Dormer family. This is her brief article from A Who's Who of Tudor Women, "Margaret Dormer was the daughter of William Dormer of Eythrope, Buckinghamshire (1503-May 17, 1575) and his second wife, Dorothy Catesby (c.1527-September 30, 1613). In a marriage settlement dated October 20, 1578, she married Sir Henry Constable of Burton Constable, Holderness, Yorkshire (c.1551-December 15,1607) and as Lady Constable was a notable recusant who spent time in prison in 1592, 1593, 1595, and 1607. She raised her children—Catherine (c.1579-1626), Dorothy (1580-March 26, 1632), Henry (c.1582-1645), Margaret (c.1582-February 27, 1662/3), John (b.c. 1589), and Mary (c.1586-April 17, 1669+)—as pious Roman Catholics."
Recusant means a person who refused to attend Church of England services, not what USA judges Antonin Scalia and Clarence Thomas should do whenever a case arises involving the privileges of moneyed people to tamper with politics.
The title is demeaning - daughter of one man and wife of another.
From bbc.co; lightness added by gogm in an unsuccessful effort to bring out details of Lady Margaret's dress.