Police were called to the Matahina Dam area about 6pm and, after an extensive search and rescue operation, Arnica's body was found in the river about 11pm.
Moses cried, and Savage remained unemotional, as Crown prosecutor Anna Pollett read out extracts of victim impact statements.
Moses' statement said: "Every morning when I wake up... I don't want to be here" and wondered when she would get peace.
She said she drank and smoked a lot to numb her pain, and two to three days a week she found it difficult to get out of bed.
Moses spoke lovingly of her daughter and the joy she brought to the family, Pollett said.
Arnica's older brother's statement said before Arnica died, his life with his family was better, with plenty of food and a lot of "chill" time.
Pollett referred to parts of the statement that said the teen was "sad, angry and lost" the night his sister died.
At her tangi, it was "hard for him to stop crying".
"Nothing felt normal without her."
Crown lawyer Anna Pollett. Photo / File
He said he often had nightmares and couldn't sleep, thinking about what happened to Arnica.
However, Davison said Savage's mental disorder reduced his moral culpability "significantly".
He read out the summary of facts, stating that Moses had started a relationship with another man, who had been a close friend of Savage's and held hope of reconciliation.
She had said she was not going to return to live with Savage.
The night before Arnica's death, Tewi Savage's father said he was "f***** in the head" and disturbed.
Savage woke five times in the night, loudly singing songs and shouting: "They're coming to get me".
His parents, who lived next door, had to help him settle and fall asleep again.
Moses had also told Savage she was worried about his mental health.
On July 1, she told him she wanted to move to Australia, which angered Savage.
He went for a walk to cool off about 4pm and told Moses to "get the f*** out of his way".
Arnica said she wanted to go with him and Savage put her in her pram.
He took a book of religious writing with him.
His parents became concerned when he did not return by dark and they were joined by neighbours and others in the village to look for Savage and his daughter.
