Her father's arrest in the Albury police station foyer led to a young pregnant woman twice assaulting an officer trying to help contain the volatile situation.
Molly Jayne Sikorski was out of control, Albury Local Court heard on Monday, when she attacked the policeman.
The 21-year-old lunged at the officer, but was grabbed by the shoulder and told to back off.
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Sikorski then turned towards the officer and swung her arm at him, hitting the body-worn camera attached to his police vest.
She ignored a second "get back" warning and lunged at the officer again, slapping him to the right side of his face.
Even after she was contained and put in a police cell, Sikorski hit him again.
Magistrate Richard Funston slammed her behaviour.
"Any assaults on police are serious," he said.
Defence lawyer Mitchell Irwin said Sikorski, a single mother, had "no real criminal record" and "there was certainly no intention to hurt the officer".
But in response, Mr Funston said it was an "extremely" serious situation "when someone thinks they can retaliate".
"It's really very serious," he said.
"The officers are only going about their job.
"They are only there to assist people."
Mr Irwin said the situation arose out of unusual circumstances.
He said the family had gone to the station to report an incident where they were approached by someone - while they were out for the night at a licensed venue - and initiated a fight.
Mr Irwin said what happened next was police came out to the foyer and, having viewed CCTV footage of that incident, placed Sikorski's mother and father under arrest.
He was charged with affray and she with assault.
Mr Irwin said Sikorski's action was an instinctive move to protect her father.
"I agree there was a slap to the face, but it was only minor."
Sikorski pleaded guilty to assault and resisting police over the incident, which happened on September 8 about 1.45pm.
Police said that after the father's arrest, he became agitated and began swearing.
Several officers grabbed and handcuffed him, then his daughter lunged at the victim.
Mr Funston told Sikorski that the "reality" of the situation was she didn't behave "very well" at all.
But due to her young age and early guilty plea, he placed her on an 18-month conditional release order, without conviction.