Wallington worked for many years as a librarian. She wrote three children's books before beginning to write in the romance genre. Nineteen of her novels were published under the Harlequin Romance line under the pseudonym Elizabeth Duke. She now writes under own name for various Silhouette lines. Romantic Times described her as "display[ing] a fine talent for storytelling as she creates dynamic characters and an intriguing conflict that will keep you guessing right up until the last page."

Wallington lives in Melbourne with her husband John. They have two grown children.

Novels

• Somewhere (1983)
• Butterfingers (1986)
• Claiming His Bride (2001)
• Kindergarten Cupids (2002)
• In Her Husband's Image (2004)
• The Last Time I Saw Venice (2005)

As Elizabeth Duke

• Softly Flits a Shadow (1985)
• Windarra Stud (1988)
• Island Deception (1989)
• Fair Trail (1990)
• Wild Temptation (1991)
• Whispering Vines (1992)
• Outback Legacy (1993)
• Bogus Bride (1993)
• Shattered Wedding (1994)
• Make-believe Family (1995)
• To Catch a Playboy (1995)
• Heartless Stranger (1996)
• The Marriage Pact (1997)
• Takeover Engagement (1997)
• Taming a Husband (1997)
• Look-a-Like Fiancee (1998)
• The Husband Dilemma (1998)
• The Parent Test (1999)
• The Outback Affair (2000)

Omnibus

• In Her Husband's Image / Then There Were Three (2004) (with Lynda Sandoval)
• Beauty Queen's Makeover / Last Time I Saw Venice (2005) (with Teresa Southwick)