The Andrews Labor government's effort to combat violence against women and children may not produce a reduction in the incidence of assaults and abuse for up to 10 years.

The problem is set to appear worse before it gets better, the government concedes, as the system changes and encourages more victims to report their abuse, with official agencies braced for a 'spike in reporting' in the coming years.

Family violence is back in the spotlight in the wake of the killing of young Geelong woman Natalina Angok, whose body was found on the street in Melbourne's Chinatown on Wednesday morning.

State Police Minister Lisa Neville and federal Labor Leader Bill Shorten co-ordinated announcements in Melbourne on Friday of policies to combat family violence.

This comes as up to 50 people attended a vigil for Ms Angok on the steps of State Parliament that evening.