She married Gerald "Gearóid Og" FitzGerald, 9th Earl of Kildare in London in about 1522. His first wife, Elizabeth Zouche had died, leaving him a son,
Thomas, and three daughters. By his marriage to Elizabeth, who was Henry VIII's cousin, Gerald gained much influence at court. Elizabeth was styled as the
Countess of Kildare. The match, while advantageous to Gerald, was also partially based on the physical attraction the couple had for one another. Historian
Mary Anne Everett Green described Gerald as having been quite handsome in appearance, and he in turn was pleased by Elizabeth. He had been a kind husband to his first wife, and his second marriage was also happy. According to historian Barbara Jean Harris, Elizabeth married Gerald against her father's will; however, in 1527 her mother forgave her by granting Elizabeth a dowry of £1000. She added the following as means of explanation for the money: "forasmuch as the said marriage is honourable and I and all her friends have cause to be content with the same". In 1523, Elizabeth returned with her husband to
Ireland, where he served as Lord Deputy of Ireland (1524–1525, 1532–1534), and as Deputy to the King's Lieutenant of Ireland (1533). Extant letters she wrote home to England, show that Elizabeth had taken a keen interest in the Irish political situation. Together Gerald and Elizabeth had at least six children: • Lord
Gerald FitzGerald, 11th Earl of Kildare, known to history as "The Wizard Earl", (25 February 1525 – 16 November 1585), married
Mabel Browne, by whom he had issue. •
Elizabeth FitzGerald, known as "The Fair Geraldine" (1527 – March 1590), married firstly,
Sir Anthony Browne (d.1548), by whom she had two children who both died young; and secondly
Edward Clinton, 1st Earl of Lincoln. Her last marriage was childless. • Edward FitzGerald (17 January 1528 – 1597), married Agnes Leigh, by whom he had issue, including
Gerald FitzGerald, 14th Earl of Kildare. • Mary (or Margaret) FitzGerald, married Richard Nugent, 3rd
Baron Delvin, by whom she had issue. • Anne FitzGerald • Katherine FitzGerald (died after 7 April 1547), who married firstly Jenico Preston, 3rd
Viscount Gormanston; and secondly
Richard St. Lawrence, 7th Baron Howth. In 1531, a private
act of Parliament assured her an income of £200 per annum as well as the Irish manor of Portlester. In October 1533, Elizabeth brought her daughter, Elizabeth FitzGerald to the English court. The girl, aged six, became a companion to the infant
Princess Elizabeth, daughter of King Henry VIII, and Elizabeth Grey's erstwhile companion at the French court, Anne Boleyn, whom the King had married in January of that year. Later, Elizabeth Grey was allegedly part of the conservative faction at court who plotted against Queen Anne. Elizabeth's husband, the Earl of Kildare, who was imprisoned in the
Tower of London on charges of corruption and plotting rebellion in Ireland, died in 1534. Elizabeth had remained with him, nursing him throughout his imprisonment from July 1534 until his death on 12 December. The Earl had received a gunshot wound at the end of 1532 in an attack he had led against the O'Carroll clan at
Birr. Elizabeth retired to her brother Leonard's manor of Beaumanoir, in
Leicestershire, while her younger sons were raised at court alongside
Prince Edward. Later her son, Edward joined her. ==Rebellion in Ireland==