Elizabeth had a brother, Sir William Darcy, who married Catherine FitzGerald, by whom he had issue.
One of her maternal aunts was Elizabeth de Burgh, the second wife of Robert the Bruce.
As they were related in the fourth degree of kinship, a papal dispensation was required for their marriage.
She married secondly, Sir Robert Lukyn de Hereford, Seneschal of the Liberty of Tipperary, between 28 December 1383 and 30 March 1384.
[citation needed] Elizabeth Darcy died on 24 March 1390, shortly before her 58th birthday.