Charlotte MacInnes felt she had her big break when she was cast in musical comedy The Deb, which was set in rural NSW and directed and co-produced by Wilson.
But MacInnes is now suing the Pitch Perfect star over social media posts claiming the young actor had complained about feeling uncomfortable after bathing with co-producer Amanda Ghost.
Wilson's social media posts suggested MacInnes had dishonestly retracted the complaint in return for a lead role in a stage production and a record deal, the young actor claims.
She denies making a complaint after sharing a bath with Ms Ghost, both clad in swimmers, to warm up after the producer suffered a medical episode at Bondi Beach in September 2023.
The pair had been staying with others in an apartment from which MacInnes was ousted after Wilson aired the alleged sexual harassment allegations.
MacInnes was flanked by supporters, including her boyfriend Carlo Boumouglbay, as she faced the Federal Court on Thursday for the second day of her testimony.
It coincides with the release of her second single Struck, which her manager previously told the court had not been timed to coincide with the court battle.
MacInnes was left "deeply wounded" and constantly on edge after Wilson's social media posts, Mr Boumouglbay revealed in an affidavit tendered to the court.
The Deb's lead actor was brought to tears and became fearful for her safety after suspecting Wilson had been monitoring her, he wrote.
When she returned to her Western Australian hometown last year, the young actor told her boyfriend that all people talked about was "Rebel and this situation".
The key issue to be determined is not whether MacInnes was sexually harassed but rather whether she made a complaint and then withdrew it, Wilson's barrister Dauid Sibtain SC said.
"Our case is that ... she changed her story," he argued during his opening address.
"We say the reason she did so is obvious. She did so to ensure her career as an actress and musician progressed by appeasing Ms Ghost."
Ms Ghost is expected to give evidence on Friday.