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.