She was taken to hospital and the doctor said her oxygen saturation was too low.
Shortly after, she tested positive for Covid-19.
Her daughter was not allowed to see her any more as she was placed in isolation.
Judith told local media her mother's last words to her were: "You can't cry. You did everything you could. I had a good life."
The doctors told her that her mother, who died the day after being admitted to hospital, refused a ventilator.
"I don't want to use artificial respiration. Save it for younger patients. I already had a good life," she reportedly told doctors.
Her daughter says the family does not know how the 90-year-old contracted Covid-19 as she "took the lockdown seriously".
The family is now coming to terms with the fact that they can't farewell her properly.
"I can't say goodbye to her, and I don't even have a chance to attend her funeral," her daughter said.
• Covid19.govt.nz: The Government's official Covid-19 advisory website