The Pitch Perfect star directed, co-produced and starred in The Deb, a musical comedy that became the battleground for multiple legal battles in Australia and the US.
Filmed on a $22 million budget, The Deb made just $335,000 at the local box office and is yet to screen outside Oceania.
Wilson's co-producers allege that shortfall could be traced to her false and derogatory statements about them online.
The Bridesmaids star claimed on Instagram that producers Amanda Ghost, Gregor Cameron, and Vince Holden tried to block The Deb's release, embezzled money, and behaved inappropriately towards the film's star.
On Friday, Justice Elisabeth Peden found the claims were her hyperbolic opinion and had not been proven by the producers to be false.
In her NSW Supreme Court decision, she ruled Wilson had maliciously published false allegations when she posted that the producers had "stolen money from the film" and caused smear websites about Ms Ghost to be created.
Justice Peden found crisis PR firm The Agency Group had acted as Wilson's agents in creating the websites, which alleged Ms Ghost was an "Indian Ghislaine Maxwell" who procured young women for sex.
Wilson has consistently denied any role in the creation of the websites, but the judge found that was "contrary to the true position".
"Ms Wilson wanted to draw negative attention to Ms Ghost and wanted to do so seemingly anonymously," Justice Peden ruled.
But she determined the trio hadn't proven they suffered actual damage as a result of the false representations.
Similarly she found there was no established loss emanating from Wilson's breach of contracts, including by releasing a clip of a song from The Deb.
The producers had sought nominal damages and so the judge awarded a mere $10.
Wilson had denied her co-producers' allegations and countersued for unpaid fees, claiming the producers' involvement in the film was marked by a troubling pattern of egregious behaviours, including theft and bullying.
Justice Peden ordered she be paid $359,000 in unpaid fees plus interest - which amounts to more than the box office takings for the flop film.
Wilson took to Instagram to welcome the victory with a photo of herself in a graduation gown holding a degree from the University of NSW.
"This girl never knew how much she was going to need that law degree!!" she wrote.
"I spoke up because I believed there were serious concerns that needed to be raised on my film The Deb.
"Defending myself has come at an enormous personal, emotional, and financial cost. But I'm proud I stood my ground - for myself and for others I was trying to protect."
Wilson said she struggled to remain positive throughout the proceedings and thanked her family and followers for their support.
It's the second victory for Wilson after she was cleared of defaming her debut film's star, Charlotte MacInnes, earlier this year following a fiery Federal Court hearing.
MacInnes claimed Wilson defamed her in four social media posts that implied she was a liar and a sellout who walked back a sexual harassment complaint to further her career.
But the court found the young actor confided in Wilson - and later recanted - that she felt uncomfortable when Ms Ghost asked to have a shower and a bath together.
That defamation decision is under appeal.
Justice Peden came to the same conclusion in her decision on Friday, that MacInnes had made the complaint about the "objectively peculiar" situation and later changed her story.
13°C