Kaur was too distressed to talk to police the day after her husband's death but not long after being interviewed, police charged her and Gurjinder Singh with murder.
The motive for the attack was not robbery, police confirmed.
Both defendants pleaded not guilty this morning.
Immediately after the incident, Davinder Singh's family said he had no enemies and believed his killing was a case of being in the wrong place at the wrong time.
Before charges were laid, the Sikh community said they would rally around Kaur to support her but she will remain in custody until at least October when she and her co-accused will be back before the court.
The couple had a 10-year-old son who was living in India, family said.
Davinder Singh and Kaur decided to send him back to be cared for by their extended family as they wanted to focus on their careers.
Davinder Singh came to New Zealand from Rajasthan seven years ago and had been working as an upholsterer at DS Furniture in Mangere.