Former Health Services Union (HSU) head Kathy Jackson has made a last-minute attempt to stop the proceedings of a civil case brought by her former employer.

The HSU is suing Ms Jackson in the Federal Court over hundreds of thousands of dollars in allegedly unauthorised spending in a trial due to begin on June 29.

The case centres on allegations she misused her union credit card to buy clothes, pay for meals and holidays, racking up hundreds of thousands of dollars worth of expenses.

The case had been delayed until recently because of Ms Jackson's mental health, but she is now seeking to stop it altogether.

Ms Jackson appeared with her lawyer via video-link from Sydney.

The hearing on the application by Ms Jackson to stay the proceedings will be heard next Monday.

The HSU has sought a freeze on Ms Jackson's assets but today it was revealed a NSW property she owned had been sold to her de facto partner, Michael Lawler.

The sale has not been formally registered yet and the HSU sought to halt that process.

The court ordered Ms Jackson not to register the sale of the property until after next week's hearing and she gave an undertaking that it would not be transferred.

Arguments also continue about numerous documents that Ms Jackson is yet to submit to the court including her passport and tax returns.

The court heard that just last week Ms Jackson offered to make her passport available for inspection yet today her lawyer said the passport could not be found.