"I asked, 'is it possible that Maggie could have accidentally ingested it herself' and [the police] said no; [the police] did not want to say what the actual chemical or drug was that was found."
Police would not comment on the toxicology results.
"This is an ongoing investigation and because of that your information is not something we would make comment on or offer a response to," a police spokesperson said.
The circumstances around her death have been mysterious. Police were initially unable to say whether Maggie died in suspicious circumstances after an initial post-mortem failed to provide clear answers.
A second autopsy was done and police announced on Friday that her death was not accidental. The same day, Detective Inspector Hayden Mander confirmed police received the results from a number of tests and examinations.
"Those results, combined with a number of discussions with various experts, lead us to the conclusion that another person or people were involved in Maggie's tragic death," he said.
Maggie's body has since been cremated.
She was born in New Zealand to her Malaysian mother and British father. He no longer lives here and she had no other relatives in the country. Police are now in contact with her grandparents who live in Malaysia and her aunt who lives in the United States.
It is understood that police have interviewed several neighbours.
Evelyn Sen has been in the care of the Auckland District Health Board since Maggie's death and was discovered that morning with minor injuries.
The news that their grandchild's death was not accidental has left the grandparents reeling.
"I was quite taken aback ... they told me that it could not be an accident. That's very clear, that was the first question I asked, thinking it could be something edible and [police] said no, Maggie couldn't have done it on her own," said Clifford Sen. "When we found out that Maggie didn't pass away naturally, that it was somebody who did it to her ... each step is getting more and more traumatic for us, especially my wife."
The child had spent about two and a half months visiting the grandparents with her mother in Malaysia before she died.
She was described as an angel who was intelligent and inquisitive.
"She loved looking at pictures and being able to describe them. She was so outward, she loved to talk about dinosaurs and the universe and things like that at her young age," said Clifford Sen.
Now, the grandparents are trying to get out of the house, where all of their memories of Maggie were made, as much as possible.
"It will get easier as the days go by but it is going to be a bumpy ride and it's going to take a long time. The best we can hope for is to come to terms with it."
