Gaby is the eldest daughter of Doug (Terence Donovan) and Pam Willis (Sue Jones). She returns to Erinsborough, after taking a business course in Japan. Gaby has been described as being beautiful, intelligent and the apple of her father's eye. Gaby opens her own fashion boutique, with the help and support from her boyfriend, and later fiancé, Glen Donnelly (Richard Huggett). Gaby and Glen's engagement ends when he flees Erinsborough following an accident. Gaby's business burns down and she becomes a punk to cope with her losses. She also befriends and briefly dates a punk musician. Gaby takes a job as a barmaid, before becoming a secretary at the Robinson Corporation.