Carmen Pinilla, 43, lashed out at the officer and her male colleague outside the Albion Park RSL on April 25 after discovering her son had been detained by police and placed in a paddy wagon a few minutes earlier.

The Oak Flats woman bit the female officer on the forearm and kicked her in the leg and groin area as she and the male officer tried to stop Pinilla from getting in her car and driving away from the scene.

Pinilla had earlier let out a string of expletives at discovering her son's arrest, directing her tirade of abuse at police while families and young children were close by.

She was charged with behaving in an offensive manner and using offensive language in public, as well as resisting arrest and assaulting police.

Pinilla pleaded guilty to swearing, but not guilty to the remaining charges and elected to take the matter to a hearing.

However, she was found guilty of the offences, with the magistrate, Mark Richardson, saying such behaviour towards police doing their duty would not be tolerated.

Pinilla's lawyer, Matthew Ward, said his client had no criminal record and was a person of prior good character, who ran a home day care and provided respite care for an autistic child at weekends.

"This was an offence highly out of character," he said, adding Pinilla had been diagnosed with a rare form of cancer in 2008, and although now in remission, the illness had caused significant stress in her life.

He suggested Pinilla could be put on lengthy good behaviour bonds as punishment.

However, prosecutor Sergeant Andrew Kingston noted Pinilla had showed no remorse for her behaviour.

Mr Richardson agreed to a two-year good behaviour bond and fined Pinilla a total of $500 for the four offences.