The companies' names are permanently suppressed.
Her defence lawyer, Paul Cox, said she had shown significant remorse for the offending.
"She immediately admitted her guilt when the offending was uncovered and began paying the reparation straight away," he said.
The woman sold her family home to help pay the reparation, he said.
Judge Grant Fraser accepted the woman was remorseful but said it didn't excuse the seriousness of the offending.
"You were in a position of trust and authority," he said. "The victims of your offending have described having total trust in you.
"They were shocked and devastated to learn of the offending.
"I accept that you have shown significant remorse but there must be consequences for your offending."
Mr Fraser said the offending was pre-mediated. "It was a significant breach of trust over a significant period of time," he said.
A probation report found the woman had suffered from a depressive illness for years.
The woman, who was emotional as she left the dock, was supported by her son and daughter in court.