CNN has reached out to her lawyer for comment.
The woman, 42, was arrested in September in the city of Ulsan, South Korea, weeks after the children’s remains were discovered in suitcases bought by a family at an online auction in South Auckland.
The court has ordered the woman’s identity and those of the victims to be withheld from the public.
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Previously, police have said the children were likely to have been between ages 5 and 10 and may have been dead for around three to four years.
According to South Korean police, the woman was born in South Korea and is a New Zealand citizen.