Brittany Higgins is appealing elements of her costly defamation battle loss to her former boss, adding another chapter to the bitter legal saga.

Linda Reynolds sued Higgins over a series of social media posts the ex-Liberal senator believed damaged her reputation.

The Western Australian Supreme Court in August found the posts were defamatory and awarded damages of $315,000 plus $26,109 interest to Reynolds.

Higgins was also ordered to pay 80 per cent of Reynolds' legal costs, which are yet to be determined, in a judgment published last week.

The former political staffer is appealing the damages award and the costs order, according to documents filed in the WA Court of Appeal yesterday.

She's also seeking to challenge the finding that she breached a 2021 deed of settlement between t

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