She said her criminal actions began after she formed a relationship with a man who had drinking and gambling addictions and who persuaded her to take the money to further his lifestyle.
She told the tribunal he had an extraordinary impact on her and because she was so "besotted" with him she was prepared to do anything for him.
Fa'amausili had since left the man, was now employed by another preschool and had managed to pay back over half the money she stole, the tribunal said.
It was satisfied her offending occurred while she was under the influence of another person.
"The respondent impressed us as a fundamentally honest person. We are quite satisfied that this is the explanation for her criminal actions, as was the district court judge who dealt with her in the criminal proceedings," the tribunal said in its decision.
She had a "vanishingly small" chance of reoffending and her crime was "out of character".
Fa'amausili was censured and for a period of three years, was not to be employed or engaged in position as a teacher or early childhood teacher which involved her having responsibility for the management of finances.