The Pitch Perfect star was sued by Australian actor Charlotte MacInnes, who played the lead role in Wilson's directorial debut film The Deb.
MacInnes claimed Wilson defamed her in a series of social media posts that implied she was a liar and a sellout who walked back a sexual harassment complaint to further her career.
The posts alleged the young actor confided in Wilson - and later recanted - that she felt uncomfortable when the film's co-producer Amanda Ghost asked to have a shower and a bath together.
MacInnes denied making or retracting a complaint, insisting she had not been uncomfortable when the pair shared a bath in their swimwear after Ms Ghost suffered a medical episode in September 2023.
Two months after the conclusion of the hotly contested court fight in the Federal Court, Justice Elizabeth Raper found in favour of Wilson.
"MacInnes has failed to establish that the publications have caused or were likely to cause serious harm," she said on Wednesday.
MacInnes' barrister Sue Chrysanthou SC accused Wilson of a "complete revision of history" littered with dishonesty during her emphatic closing address in May.
"She is a fantastical liar who has made up terrible, terrible allegations about multiple people and her own witnesses have discredited her," she said.
"We say Ms Wilson cannot be believed on anything she has said."
But Wilson repeatedly denied accusations she fabricated the complaint or raised it for leverage during disputes with her co-producers over the film's budget and writing credit.
"I am known as a truth-teller," she declared during the hearing.
That was what she had been doing when she posted the stories to her 11 million followers, the Bridesmaids star said.
"I don't classify it as an attack, I classify it as telling the truth," she told the court.
Her barrister Dauid Sibtain SC said his client had "no motive to lie" about something that would endanger her film by driving a wedge between her lead actor and a producer.
Instead, he accused MacInnes of dishonestly withdrawing the complaint about Ms Ghost to ensure her relationship with the producer continued to be fruitful.
MacInnes had received a lead role in a stage production and a six-figure record deal that were linked to Ms Ghost, he argued, and she wanted to ensure she continued to rise.
"Ms MacInnes is someone who gave false evidence under oath," he said.
"(She) has suffered no harm, let alone serious harm."
The young actor sought aggravated damages for the harm allegedly wrought by the posts, including anxiety, a period without work.
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