A New South Wales woman has pleaded guilty to common assault for throwing an egg at the Prime Minister's head during the election campaign.

Key points: Amber Holt cried after pleading guilty to common assault for egging Scott Morrison

Amber Holt cried after pleading guilty to common assault for egging Scott Morrison The egg bounced off his head instead of breaking

The egg bounced off his head instead of breaking Holt previously pleaded guilty to possessing cannabis, which she was found with in the egging aftermath

Amber Holt, who was 24 at the time, threw the egg at Scott Morrison's head while he was campaigning at the Country Women's Association (CWA) state conference in Albury in May.

The egg did not smash, instead bouncing off the Prime Minister's head.

Holt sobbed after she pleaded guilty to the charge of common assault at Albury Local Court on Monday.

In May she pleaded guilty to possessing cannabis, which was found on her after the egging.

Amber Holt pleaded guilty to common assault. ( ABC News: Erin Somerville )

Magistrate Imad Abdul-Karim pointed out an equivalent offence of causing harm to a public official under Commonwealth legislation carried a sentence of several years in prison.

He said he had difficulty assessing the gravity of the offending.

"The offending was intended to make a political statement by committing an act of violence," Mr Abdul-Karim said.

He said any political protests should be carried out peacefully.

"There's no place for violence, particularly no place for violence during political campaigning," he said.

"[Politicians] should be free to express their political view at these events."

The egg that hit Scott Morrison did not smash. ( ABC News: Dan Conifer )

The prosecution argued the assault was, to an extent, aggravated because Holt had planned it.

Holt's lawyer told the court the Prime Minister was unharmed by the egging.

The egger, who was supported by a friend at the hearing, told media outside Albury Court House she was remorseful and admitted she was worried about the prospect of jail time.

She said the ordeal, and the potential heavy penalties she now faced, had served as a lesson for her, and should also for other protesters.

"Definitely, definitely don't do what I did," Holt said.

A 70-year-old woman, Margaret Baxter, was knocked over during the melee, but said she was unhurt.

Amber Holt was escorted from the CWA event earlier this month. ( ABC News: Adam Kennedy )

Mr Morrison at the time said he was concerned for the elderly woman.

"I helped her up and gave her a hug," he tweeted.

Ms Holt will return to court later this month for sentencing.