Following her tenure as the Miss World organization's global representative, Hayden moved to London and studied acting at the Royal Academy of Dramatic Art. She also studied at the Drama Studio London, where she concentrated on the works of Shakespeare and earned a Best Actress nomination from the studio. In 2001, she made her screen debut in the film version of Shakespeare's Othello in South Africa.
She hosted Miss Europe twice in 2001 and 2002 in Lebanon, along with Miss Lebanon 1997 and Julien Lepers. Diana was signed by the Avalon Academy in 2006 as the face of the Academy and currently serves as a celebrity Guest Lecturer for airline personnel training programmes.