At the age of eight she was sent to the Tower of London along with her mother, Margaret de Clare, Baroness Badlesmere and her four siblings after the former refused entry to Queen consort Isabella to Leeds Castle by ordering archers to open fire against her group.
Elizabeth's father was hanged, drawn and quartered on 14 April 1322 for having participated in the Earl of Lancaster's rebellion against King Edward II of England; and her mother imprisoned in the Tower of London until 3 November 1322.
The Badlesmere estates were divided among the four sisters, and Elizabeth's share included the manors of Drayton in Sussex, Kingston and Erith in Kent, a portion of Finmere in Oxfordshire as well as property in London.
The marriage contract was made on 9 May 1316, and the particulars of the arrangement between her father and prospective father-in-law are described in Welsh historian R. R. Davies' Lords and Lordship in the British Isles in the late Middle Ages.
[4] The marriage, which was not consummated until many years afterward, produced two sons: By the order of King Edward III, Elizabeth's father-in-law, the Earl of Mortimer was hanged in November 1330 for having assumed royal power, along with other crimes.
Mention of Elizabeth's burial is found in the records (written in Latin) of Walden Abbey which confirm that she was buried in Black Friars: Anno Domini MCCCIxx.obiit Willielmus de Boun, Comes Northamptoniae, cujus corpus sepelitur in paret boreali presbyterii nostri.