Moran, 66, bowed her head and became teary as the foreman announced the verdict in the Supreme Court
It took the jury of nine men and three women six days to reach their decision after a month-long trial.
Ex Rebels bikie president Geoffrey “Nuts” Armour shot Des Moran, 61, inside his favourite Ascot Vale cafe in front of several witnesses on June 15, 2009.
The jury was told Judy Moran drove Armour and his friend turned prosecution witness Michael Farrugia to and from the scene and later disposed of evidence.
Prosecutor Mark Rochford, SC, told the jury the plot was an agreement between Judy Moran and Armour due to an on-going financial dispute.
“This was a planned and calculated murder motivated by (Judy) Moran…and an on-going financial dispute with (Des Moran),” Mr Rochford alleged in his opening address.
Farrugia, who told the trial he thought he was helping Armour on a debt-collecting mission, gave evidence against Judy Moran.
In sworn testimony he said she was the driver and told the two men she would get rid of evidence after the shooting.
Moran had pleaded not guilty to murder and accessory after the fact.
She gave evidence herself, claiming she was at Fawkner Cemetery visiting her son Mark’s grave on the morning of Tuppence’s murder – which was the day of the ninth anniversary of Mark’s death.
“Obviously you don’t know me as a person,” she told Mr Rochford while under cross examination.
“I wouldn’t be involved in anything like that at my age now – let alone all the other 60 years.”
The jury did not believe her.
Detectives arrested Moran after she drove the getaway car from her garage and dumped it in a Brunswick street while wearing gloves.
After arresting Moran, detectives searched her house and found the murder weapon and clothing linked to Armour and Farrugia stuffed in a hidden safe.
Justice Lex Lasry will sentence Moran on a date to be fixed.
Before the trial, Farrugia, 46, pleaded guilty to manslaughter and received four years’ jail with a two-year minimum term.
Armour, 45, has pleaded guilty to murder and is yet to be sentenced.
His de facto, Suzanne Kane, 47, pleaded guilty to being an accessory after the fact and received a suspended sentence due to time served while on remand.