Gina Rinehart's youngest daughter spent an average of $100,000 a month while her three estranged siblings were launching their legal action against their mother.
Documents released by the NSW Supreme Court yesterday reveal that in the 2011-2012 financial year, Ginia Rinehart was given $831,255 from the family trust that is at the centre of the long-running family dispute.
For the months of August, September and October 2011, she was paid a total of $303,356.
Her three siblings - John Hancock, Bianca Rinehart and Hope Welker - launched their legal action on September 5 and were subsequently cut off financially by their mother. Ms Welker has since dropped out of the case.
Exact details of the then-25-year-old's expenses have been redacted from the documents released yesterday but are described as being "for travel, accommodation and other living expenses including the payment of credit cards".
The payments coincided with Mrs Rinehart's gift to Ginia of a $1.2 million Rolls-Royce, despite the fact she did not have a driver's licence.
At the time, Ginia was the only one of Mrs Rinehart's children who had sided with her.
The extent of payments given to the youngest Rinehart are contained in documents filed by her siblings John and Bianca, who are fighting their mother for their share of the trust's distributions while they battle her in court over its management.
Documents filed in the long-running case allege that while Ginia got money from the trust, Mrs Rinehart has withheld $398,206 in payments meant to go to her siblings since the legal action began. The case resumes in February.