Short answers, pulled from the story.
Margaret Shelton was the youngest daughter of Sir John Shelton and his wife Anne. Her mother Anne was the sister of Thomas Boleyn, 1st Earl of Wiltshire, which made Margaret and her sister Mary first cousins to Queen Anne Boleyn.
Biographer Antonia Fraser identified this woman as Margaret Shelton based on available evidence at the time. Modern scholars now point to confusion over handwriting where the letter y looked like g, leading historians to believe it was Margaret when the records actually described her sister Mary.
Margaret attended her cousin Queen Anne Boleyn during Easter Eve on the 12th of April 1533. She witnessed the queen make her first public appearance as monarch that day.
Hugh Latimer later identified Madge Shelton as the attendant present when Anne miscarried shortly after Katherine of Aragon died. Norris and Weston were executed on charges of having been lovers to Anne Boleyn despite their actual relationship with Madge.
Madge married Thomas Woodhouse, son of Sir Roger Woodhouse or Wodehouse who died in 1560. Her husband participated in the battle of Pinkie in September 1547 where some sources suggest he was killed.