An independent investigation into the death of a six-year-old girl who was killed at her home on the Isle of Wight three years ago, has found that it "could not have been predicted".
Keziah Flux-Edmonds was drowned by her father Darren who then took his own life in June 2016.
The 44-year-old, who was mentally ill, had been receiving behaviour therapy treatment from the Isle of Wight NHS Trust.
Kezia's mother Nikki said she and her daughter had been "put at risk".
The NHS England report also stated there was enough evidence to suggest that, at the time, Darren was at significant risk of ending his own life by suicide.
Nikki believes the authorities "failed to communicate with Darren effectively".
The report found information recorded by the trust staff was "minimal" and no effort was made to contact Darren's family.
It also found that, because Darren had dyslexia and no adjustments were made to accommodate this, he was unable to complete written homework given by a therapist.
There was evidence Darren's comments to staff indicated elements of domestic abuse, which "should have triggered concerns among practitioners".
Chief executive at the Isle of Wight Trust, Maggie Oldham has apologised to Nikki, paying tribute to her "strength and dignity" throughout the process.
She also added that the trust is sorry it "did not do more".
The trust says it has now made changes to the way its staff are trained and assessed.
A child protection training programme has been brought in across the trust.