A three-year-old girl spent up to two days home alone after her mother died in the house.

Lauren Ruthella Silbery, 28, was found in her Upper Hutt home about 7pm on Friday, October 21.

Her daughter has since spent four days in Hutt Hospital, where she was treated for dehydration.

Ms Silbery's mother Heather had not heard from her daughter for two days and went to the address to investigate. She says they spoke very often.

"Lauren and I were very close - she would ring me every morning.

"One day I was in the garden and that afternoon at about four o'clock . . . her brother Peter and I said, 'Well, we haven't heard from Lauren'.

"So we got a friend to go around there and [the grandchild] had come to the cat door, but Lauren hadn't, so I dialled 111."

Police saw the three-year-old inside the house and taught her how to open the door by getting her to stand on a coffee table.

Heather says the child fed herself from the fridge and has now recovered.

"[She] is still a bit quiet, but she still smiles and she's one of those kids that makes you laugh and you love to have her around.

"When we started cleaning and taking Lauren's stuff out of the flat, she did say 'Mummy won't wake up' and when we went back in, she had shut her mother's bedroom door.

"She goes all around the flat happy, but she would not go in that room."

Ms Silbery was a good person, Heather says.

"Her daughter was everything to her.

"She was the type of person who had a nice way of bringing people together."

The toddler is now in the care of her family.

Senior Sergeant Jason McCarthy said police believed Lauren's death was not suspicious but were awaiting post-mortem results.

Lauren's funeral was held on Friday.