Alicia Merehan Reiri wept in the dock as she was convicted of assaulting a 6-year-old child who swore at her.
The 28-year-old pleaded guilty to assaulting the child through duty lawyer James Elliott when she appeared before Judge Tony Walsh in Masterton District Court on Thursday.
Police prosecutor Sergeant Garry Wilson said on December 1, Reiri was shopping in Masterton when members of the public witnessed her hit the child on the side of the face.
They rang police.
"The child was crying and holding her face," he said.