Her offending came to light when an audit of the school's finances by a major accounting firm revealed "multiple fraudulent transactions".
Court documents show the cheques ranged from just over $800 to almost $3000, adding up to $21,023.83. Four of the theft charges relate to cash totalling $5867.79 while the fifth relates to fuel worth $4088.13. The total value of cheques, cash and fuel is just under $31,000.
Ms Murray said publishing her client's name would cause extreme hardship to her family. She also needed time to inform wider family and the community groups she was involved with.
Judge Davis, however, said no evidence had been presented to support the claim of extreme hardship and, given that the charges were laid on March 1, she had had time enough to inform people of her situation. The arguments for granting suppression were not sufficient to outweigh the principle of open justice, he said.
The application for suppression was opposed by police and the Advocate.
Ms Murray said her client was deeply ashamed and remorseful, and was prepared to take part in restorative justice. She is due to be sentenced on June 23.