Her crimes were discoveredÂ when another director of the company – MarcÂ Marusco – started getting phone calls from creditors whose invoicesÂ were not being paid.
The company subsequentlyÂ went into voluntary administration in 2016.
MsÂ Martincic’s lawyer Patti Chong agreed with JudgeÂ Michael GethingÂ when he suggested the 41-year-old was “regretful” but not remorseful for what she had done.
“She maintains that she was authorisedÂ to do what she did,” Ms Chong said.
“We ask your honour to be as merciful as possible in the sentence.”
State prosecutorÂ David Thiering saidÂ Martincic’s offencesÂ were carried out to finance her lifestyle and that her offending “significantly” contributed to the demise of M3 Residential.
The court heardÂ Martincic had purchased a three-storey $2.7 million home in Applecross and wore designer clothing, some of which was given to her for free by a personal friend who was aÂ designer.
“[The offending] was all done to finance her lifestyle,” MrÂ Thiering said.
“All of this was planned and calculated.
“She repeatedlyÂ and extensivelyÂ stole money over long periods of time.
“There is no evidence of contrition or remorse.”
JudgeÂ Gething said he was satisfied M3 Residential went into voluntary administration as a consequenceÂ ofÂ Martincic’s actions.
The court was told Martincic had also been declared bankrupt.
“Your offending was not a spurÂ of the moment decision,” Judge Gething said.
“The stealing was in your case deliberate, deceptive and systematic.”
Judge Gething said the offences demonstratedÂ a significant breach of trust and had been “devastating” for MrÂ Marusco and his business.
Outside court MrÂ Marusco said: “I’m relieved, I am glad it is over.”
Martincic’s six-year term will take effect from Friday. She was made eligible for parole.
Phil is a Fairfax Media journalist based in Western Australia and covers court, crime and police