The 23-year-old Eaglehawk woman pleaded guilty in the Bendigo Magistrates' Court on Tuesday to the charge of discharging a missile during the incident on July 5 last year.

The court heard an argument started between the two after the woman refused to give her then-boyfriend a lift to another town.

She had a nap after the initial argument, which then re-ignited when she returned to the kitchen, prosecutor Sergeant Mark Snell said.

He said the woman started throwing pieces of a baby capsule at her boyfriend, who told her to "stop throwing stuff".

The court heard the woman called the man a "piece of s***" and threw a butter knife at him.

The man went to leave the house when the woman threw a coffee mug, which hit the man in the back of the head.

Children were also present in the house but did not witness the incident, the court heard.

Police were called to the property and the woman made full admissions.

Magistrate Patrick Southey said domestic violence remained a serious problem in Bendigo.

"It's obvious there is far too much domestic violence in the community, whether it's women against men or men against women," he said.

"Violence from women against men remains under reported, as men can be embarrassed to make a report."

The woman was fined $400 and did not receive a conviction.