Upon finishing university, Garde-Wilson worked as a law clerk for the law firm Pryles & Defteros. In 2024, Garde-Wilson was listed among "The 8 best criminal lawyers in Melbourne" by
The Canberra Times.
Melbourne gangland killings Garde-Wilson came into the public eye during the
Melbourne gangland killings as a legal representative for several persons investigated by the Victoria Police from 1998 to 2006 in relation to the killings, specifically the high-profile trials of
Carl Williams and
Tony Mokbel. Garde-Wilson was the girlfriend of convicted murderer
Lewis Caine, who was murdered in the gangland killings. In 2005, Garde-Wilson was found guilty of contempt of court after refusing to testify against the two men charged with the murder of her boyfriend Lewis Caine, saying that she feared for her life. In the course of he involvement, she represented several high-profile clients who were unknowingly compromised by their own attorney,
Nicola Gobbo, who was secretly acting as a police informant under the codename "Informer 3838" (also known as Lawyer X). Garde-Wilson's concerns about leaks within the legal system and her public questioning of the legal integrity of Victoria Police began to intensify during the late 2000s. However, her calls for broader public and legal scrutiny that eventually exposed Nicola Gobbo's role as "Informer 3838" escalated significantly around 2018 when the media first publicly disclosed Gobbo's role as an informant. Following the revelations surrounding Nicola Gobbo's dual role as a lawyer and a police informant, the
Royal Commission into the Management of Police Informants was established. Garde-Wilson provided testimony during this inquiry, which scrutinized the conduct of Victoria Police Garde-Wilson, along with other prominent Australian lawyers, called for significant reforms. In July 2023, following the closure of the Lawyer X Office of the Special Investigator, these legal practitioners, including Garde-Wilson, demanded an official apology from former Victorian Premier
Daniel Andrews, emphasizing the need for reforms to restore integrity within the judicial system.
Other notable cases In 2016, Garde-Wilson filed an appeal for the first Lawyer X case concerning convicted trafficker Rob Karam, who was involved in Australia's largest
MDMA importation known as the "Tomato Tins" case. Convicted in 2012, Karam was implicated in smuggling 4.4 tonnes of ecstasy pills, valued at $122 million, hidden in tomato tins – a scheme purportedly orchestrated by the
Calabrian Mafia. This case drew significant media attention due to the scale of the drug importation and the controversial involvement of Nicola Gobbo who also provided information to police about Karam. In 2019, Garde-Wilson represented Athar Almatrah in a case involving an alleged setup to ambush Rocco Curra, a member of the
Mongols motorcycle gang, using a fake Instagram account. During the proceedings, Garde-Wilson disputed the evidence against Almatrah, challenging the claims about her client's intent and the credibility of the testimony from co-accused individuals. Garde-Wilson represented Osman El-Houli in the trial held by the
Supreme Court of Queensland in 2022, where he was accused of driving from Melbourne to Queensland to collect 400kg cocaine, but the jury found him not guilty after deliberating for four hours and he was acquitted of all charges. In 2022, Garde-Wilson acted as the defence attorney for Tony Larussa before the
Court of Appeal in Western Australia. Larussa, initially sentenced over involvement in a methamphetamine operation, successfully appealed the conviction and was acquitted of all charges. In 2024, Garde-Wilson represented reputed Melbourne underworld boss Fadi Haddara who faced legal proceedings regarding firearms charges. The charges included possession of unregistered firearms and handling a stolen
Glock handgun. In 2025 proceedings before the
Victorian Magistrates' Court, all firearms-related charges against Fadi Haddara were withdrawn following an assessment of the available evidence. The court then ordered costs against the prosecution amounting to $20,000. == Civil litigation ==