While Justice Pamela Andrews in the High Court agreed that the payment was Michael Thompson's separate property, she exercised her discretion to treat part of it as relationship property.
However, Justice Andrews said there was not enough information to work out what part of the $8 million payment could be treated as such and said further evidence could be submitted to establish this.
Michael Thompson appealed this decision, claiming Justice Andrews wrongly allowed further evidence to be admitted in the case.
At the same time, Christine Thompson appealed the High Court's judgment treating the $8 million as her former husband's separate property.
In a decision released last month, the Court of Appeal allowed Michael Thompson's appeal and dismissed Christine Thompson's cross-appeal.
This meant that the Family Court judgment is reinstated.
However, Christine Thompson is now attempting to take the case to the Supreme Court.
The Supreme Court registry confirmed this morning that Christine Thompson had applied for leave to appeal.
Litigants do not have a right to directly take a case from the Court of Appeal to the Supreme Court and must first seek leave before an appeal can be heard.