Her genealogical sketch is here. Lisby1 has a different version of this portrait on her flickr photostream with this biographical note, "Diana Drury was the youngest daughter of Sir William Drury of Hawstead (1550-1590), Suffolk, and the sister of Sir Robert Drury (1575-1615). In February 1616/7 she became the second wife of Edward Cecil (1572-1638), later Baron Cecil of Putney and Viscount Wimbledon, a noted soldier and politician, and grandson of William Cecil (1520/21-1598), the first Baron Burghley. The couple had one daughter, Anne, who died in infancy in 1618. Viscountess Wimbledon died in May 1631, and was buried at St Mary's Church, Wimbledon; her husband survived her and in 1635 married his third wife, Sophia, the seventeen year old daughter of Sir Edward Zouch of Woking, Surrey. Despite his three marriages, Viscount Wimbledon failed to produce a surviving male heir. Upon his death in 1638 his title became extinct, and his estate was split between his four daughters from his first marriage."
From invaluable.com-auction-lot-circle-of-paul-van-somer-antwerp-c.-1576-1621-lo-61-c-oi0zl7tgob#. Also posted to the Transition from Ruffs to Collars - 1620 to 1630 Album.
Diana appears to be wearing two capelets - one of sheer fabric and the other of lace that bothe end in sheer ruffs.
Keywords: van Somer, Diana Drury, Viscountess Wimbledon, Drury family, Cecil family, Viscountess, British, straight coiffure, jeweled floral headdress, lace capelet, high enclosing neckline, neckline ruff, tabbed slashed bodice, tabbed virago paned sleeves, arm bands, draped jeweled bodice ornament, clasps, bodice ornament, waist band, vee waistline