Wilson is being sued by Charlotte MacInnes, the 27-year-old lead actor of the musical comedy The Deb.
The rising star claims she was defamed by Wilson in social media posts that suggested she was a liar and a sellout who withdrew a sexual harassment complaint to advance her career.
The posts alleged MacInnes confided to Wilson - but later recanted - that she felt uncomfortable when the film's co-producer Amanda Ghost asked to have a shower and a bath together.
The claim hinges on a medical episode suffered by Ms Ghost at Bondi Beach on September 5, 2023, which led to her sharing a bath with MacInnes in their swimwear to warm up.
The young actor maintains she doesn't think it was inappropriate and insists she never made or retracted a complaint.
Wilson gave evidence she was shocked by the divulgence and informed The Deb's local producer Greer Simpkin, who she described as very responsible.
The local producer is set to reveal her recollection of events in the Federal Court on Friday during the final day of the blockbuster defamation battle between the film's director and star.
Ms Simpkin orchestrated MacInnes' removal from an apartment where she had been staying with Ms Ghost and others during pre-production, the court was previously told.
The local producer confirmed to Ms Ghost that MacInnes had been asked to leave the apartment days after the complaint had been relayed by Wilson.
"I asked that the reason be as we discussed that Rebel needs the space by the beach," Ms Simpkin texted.
But when MacInnes learned the real reason for her eviction was the complaint alleged by Wilson, her agent reached out to Ms Simpkin to "mend this misunderstanding".
She explained MacInnes' version of events and clarified she had never been uncomfortable with Ms Ghost, whom she respected and idolised.
In the email tendered to the court, the agent said MacInnes had been very upset by the change in the producer's behaviour and she wanted to resolve the issue expeditiously.
Ms Simpkin forwarded the email to Ms Ghost and noted the young actor's version of events was different from those of the producer and a witness.
"Charlotte is walking back the statement she made to Rebel," she wrote.
"I feel there is some fudging being done by Charlotte."
The local producer is expected to be questioned about what and when she was told about the bath incident and how events unfolded in the aftermath.
The high-profile defamation battle between Wilson and MacInnes is set to conclude on Friday after nine days of heated evidence in which both actors rejected accusations of lying.
