Short answers, pulled from the story.
Elizabeth Somerset, Countess of Worcester (1502-1565), was a lady-in-waiting to Queen Anne Boleyn and the principal witness against her in 1536. John Hussee, agent of the Lord Deputy of Calais, identified her as "the first ground" of the charges that led to Anne Boleyn's execution.
Elizabeth Somerset testified in 1536 that Anne Boleyn had committed adultery with Henry Norris, Mark Smeaton, and George Boleyn, including the charge of incest with her own brother. Her accusations, recorded in Lancelot de Carle's poem about the charges against Anne, were described by contemporaries as the primary basis for the prosecution.
Historical accounts say Elizabeth Somerset may have been a mistress of King Henry VIII, though this is not confirmed with certainty. The suggestion is part of her documented connection to the Tudor court.
Elizabeth's half-brother, Sir William Fitzwilliam, 1st Earl of Southampton, later became very active in the Boleyn inquiries that her own accusations helped to ignite. Her father, Sir Anthony Browne, was a trusted courtier of Henry VIII.
Elizabeth Somerset lived until 1565 and attended the coronation of Elizabeth I on the 15th of January 1559, wearing a gown of silver tissue. She died between the 20th of April 1565, when her will was dated, and the 23rd of October 1565, when it was probated, and is buried in Chepstow, Monmouthshire, Wales.
Elizabeth Somerset gave birth to a daughter in 1536, the same year she testified against Anne Boleyn, and named the child Anne. Whether this was done in honor of the queen she had helped condemn is not documented as a certainty, but the naming was noted by contemporaries.