Clare Rewcastle Brown claims her defamation conviction is linked to her work on the 1MDB corruption scandal.
Najib's Razak's incarceration for the 1MDB scandal was seen as a rare triumph in the courts.
Donald Trump is the first ex-US president to face charges but ex-leaders elsewhere have stood trial.
She is known for her lavish tastes, including 272 Hermes bags that were found at the couple's residence.
The decision to jail Malaysia's Najib Razak has revived faith in the country's discredited courts.
Najib earlier denied charges of appropriating millions of dollars from a state-owned wealth fund.
David Solomon is being punished for the bank's involvement in the fraudulent Malaysian investment fund.
Trolleys full of luxury goods and cash have been wheeled away from the home of Malaysia's ex-PM Najib Razak, according to police.
