Rhiannon Cooper, 31, pleaded guilty to unlawfully assaulting two people at the Horsham Magistrates' Court on Wednesday.

The court was told on October 18, 2020, Cooper and her ex-partner got into a physical altercation after Cooper confronted him about kissing another woman.

At 6.45pm Cooper physically confronted the victim in their Horsham home. The victim pushed Cooper away and attempted to leave the residence in his car.

The court was told Cooper stood behind the parked vehicle in an effort to stop the victim from leaving, and afterwards grabbed the keys from the car and took them inside.

Police arrived at the residence at 7.02pm and separated the two, who refused to tell anything about the assault to police.

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Later that night, at around 9.15pm, Cooper's ex-partner and the woman in question were driving in Horsham when they noticed Cooper's brother following them in his car.

The two arrived at a set of red lights on Firebrace Street, during which Cooper exited her brother's car and attempted to open the driver's side door of her ex-partner's car.

The court heard she hit the front of the car multiple times while asking the victims to get out of the car.

The victims drove to Horsham police station, and while parked outside Cooper approached the driver door and dove over to attack the other woman in the car.

She then ran to the other side of the vehicle and grabbed the woman's hair, scratching her cheek.

While this occurred police inside the station heard screaming and went outside to investigate.

Cooper punched the woman on the right side of the face, and the police broke up the fight and took the victims inside the police station.

The court was told Cooper made full admissions to the assault after her arrest and stated she had "just lost it" when she had tried to talk to the victim.

She also told police that she did not think she hit the victim, but she was in a very big rage due to the victim smirking and laughing at her.

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Magistrate Bruce Cottrill said the incident was a severe emotional reaction and was uncharacteristic of Cooper considering her lack of criminal history.

"It would appear that the accused certainly acted out of a case of severe emotional upset. It is an inexcusable behaviour, but from all of the material I have read it is uncharacteristic," Mr Cottrill said.

"It is certainly an unfortunate set of events, but I accept that there are factors that may have contributed to your offending, which you have addressed by seeing a mental health practitioner. Otherwise there are supports in the community that are available to you.

"I am satisfied to that extent that this is a hiccup in your life and won't occur again."

Cooper was sentenced without conviction and required to undertake a good behaviour bond.

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