Joan Welles died about 1474/5. The exact date of her death is not known; however she likely died shortly before her father and brother were attainted, five years after their executions, by the Parliament of January–March 1475. As a result of the attainders, all their honours were forfeited, including the baronies of Welles and Willoughby, which should have been inherited, respectively, after Joan Welles' death, by her uncle of the half blood, John Welles, 1st Viscount Welles, and her second cousin, Christopher Willoughby, 10th Baron Willoughby de Eresby. According to some historians, the attainders were passed by Parliament in order to enable Edward IV to grant Joan Welles' lands after her death to her husband, 'the trusted Yorkist Sir Richard Hastings', and accordingly, on 23 January 1475, the King granted Hastings a life interest in the greater part of the Welles and Willoughby estates. Moreover, Hastings was summoned to Parliament from 14 November 1482 to 9 December 1483 by writs directed "Ricardo Hastyng de Wellys", whereby he is held to have become either Lord Hastings of Welles, or Lord Welles.