Suzanne Louise Armstrong, 32, represented herself in the Launceston Magistrates Court on Tuesday.

She pleaded guilty to one count of common assault.

Police prosecutor Natalie Clark said the incident started in a unit in Invermay Road, Mowbray, about 4pm on June 30.

She said Armstrong had been drinking heavily for most of the day and there were other people in the unit, including her mother, the female victim and several men.

Armstrong disliked the other woman and began to scream at her to leave, which the woman was already doing, Mrs Clark said.

The prosecutor said the abusive, aggressive Armstrong swore at the woman, pulled her hair, punched her to both sides of her face and the woman defended herself.

The two women ended up on the nature strip beside the road and then on the roadway in Conway Street.

Mrs Clark said Armstrong continued to punch the woman, kicked her to the stomach and stomped on her head four to five times.

A passing motorist had to stop to avoid the women on the road.

The prosecutor said that during Armstrong's interview with police, she said she was defending herself against the woman.

"She admitted she was very drunk," Mrs Clark said.

"She denied kicking or stomping on the complainant's head."

Armstrong told the court she had been defending her mother who was elderly and ill.

"I'm very protective of my mother," she said.

Armstrong confirmed she had done an anger management course in the past and had a history of drug and alcohol problems.

"I drink very little these days," she said.

Magistrate Sharon Cure ordered Armstrong to attend an assessment for probation and adjourned sentencing to Thursday at 2.15pm.