When Rosie Batty's 11-year-old son, Luke, was killed by his father at cricket practice south-east of Melbourne she could have let her grief overwhelm her.

Instead, she is using her energy and her new public profile to campaign against domestic violence, so that no mother needs to suffer again what she went through.

In February, Luke was killed by his father Greg Anderson in front of horrified onlookers at an oval in the small town of Tyabb.

Anderson was shot by police at the scene and later died in hospital.

"It was a total act of hatred and anger towards me, by Greg, because he couldn't control me and Luke anymore," Ms Batty told ABC's 7.30.

It was the culmination of a decade of abuse by Anderson against her, and two more brutal and high-profile cases in Victoria in recent weeks have only strengthened Ms Batty's resolve.

On Tuesday night, hundreds of people turned out to a silent vigil to remember Melbourne woman Fiona Warzywoda.

She was allegedly killed by her former partner and father of her four children. She had recently taken out an intervention order against him.

The vigil came just two days after a separate incident in which two girls, aged three and four, were allegedly killed by their father in a quiet suburb.

On Thursday, Ms Batty met leaders of Victoria's domestic violence networks to learn more about the systems that are supposed to help protect families, but so often let them down.

"I couldn't afford any legal representation, so I was very alone on the the journey trying to understand what was happening," she said.

"There are many things that I believe caused greater stress and confusion and were unsupportive, but mainly the intervention orders and the disrespect Greg showed for the court system.

"And, really, how the court system doesn't take seriously this constant reoffending and disrespect."

Reported family violence grows 40 per cent in two years

Every week in Australia, at least one woman dies at the hands of a current or former partner, and last year police attended 180,000 call-outs to family violence disputes.

The number of reports of family violence to police has increased by 40 per cent over two years in Victoria alone, but funding for services is stretched.

One women's organisation in Melbourne's west has seen demand for their violence services increase by 35 per cent for two years in a row.

However, there has yet been no corresponding increase in funding from the Victorian Government.

"We see it as a matter of priorities," said Rodney Vlais of No To Violence, the umbrella organisation for groups in Victoria providing services to try and change men's behaviour.

"Governments have the choice either to fund this work or to actually choose to let their priorities lie elsewhere while women and children die."

Ms Batty says while individually many agencies do their best to help women, the problem is a lack of coordination between the multiple agencies dealing with perpetrators of violence.

"No organisations work together. The police, corrections, child protection, welfare services, they don't have a complete picture of one individual, so there's no cohesiveness," she said.

"We've got to push the politicians and we've got to say, you put so much focus on your public transport safety and all these areas of public concern, but we don't go the hard yards and really look at this huge, huge societal problem.

"And it's not going away."