Bali Nine drug courier Renae Lawrence could face charges of conspiracy to murder and additional years in jail for allegedly ordering a hit on two female prison guards.
The alleged plot came to light when mobile phones belonging to Lawrence and another female prisoner were found during an unrelated raid of the women's block in Bali's Kerobokan Prison on Thursday.
A blade was found in Lawrence's cell, while another "commando knife" was discovered in the cell of her alleged accomplice.
The jail's governor Gusti Ngurah Wiratna told AAP that evidence was found on the phones of Lawrence and alleged accomplice Joaninha Maria Sonia Gonzales, known as "Black Sonia".
"She (Lawrence) was discovered to be plotting the murder of two female guards," he said.
"In her phone was a message in which she ordered Sonia to eliminate the female guards.
"We found a knife in her cell."
An earlier media report said Lawrence was plotting to murder one female guard she "hated".
The governor said they were still investigating the motive and a decision on whether she could face charges had not yet been decided.
"At first she (Lawrence) denied it but after we showed her the evidence in her phone, she couldn't deny it."
Gonzales is an East Timorese inmate charged with kidnapping a baby from a French family in Bali.
Lawrence is serving 20 years for her part in a 2005 plot to smuggle more than 8kg of heroin from Bali to Australia.
The 36-year-old from Newcastle - recently described by Mr Wiratna as a model prisoner - has received more than two years in remissions and had about 10 more years to serve.
Lawrence was moved to a jail in Jembrana, West Bali, on Saturday.
A spokesman for the Department of Foreign Affairs and Trade told AAP consular officials in Bali will be meeting Indonesian authorities to discuss Lawrence.
