It found it wasn't possible to predict her murder by her ex husband.
That's according to the county's domestic homicide review panel who's looked into the death of Mingzi Yang who's body was found at her house in Sincil bank in 2014.
Grimsby man 36 year old Wai Hong Tsang was jailed for life for killing her.
Their report found that although agencies had evidence Ms Yang has suffered from coercive control and domestic abuse they were limited in what they could do.
Now police and health services are retraining their workers in spotting signs of violence.