Police are investigating claims made by would-be concertgoers that they have been left out of pocket, some by thousands of dollars, in a ticket-selling scam.
In complaints filed with police, Toni-Marie Matich has been accused by dozens of people of not delivering the tickets they paid for to attend concerts such as Elton John, Fleetwood Mac and Ed Sheeran.
Ms Matich is the ex-chief executive of the medical cannabis lobby group United in Compassion. She made headlines last year for giving her eldest daughter, who suffers from a progressive form of epilepsy, cannabis oil as a form of medication.
Ms Matich stepped down late last year and the group announced it was heading in a new direction.
"The organisation is making a fresh start after its former CEO, Toni-Marie Matich, was accused of fraud and subsequently hospitalised under mysterious circumstances two weeks ago," it said in December.