"Continuing the conversation around intolerance and racism is crucial."
A 49-year-old man has also been arrested.
Anyone with information is urged to contact police.
The incident took place in Cromwell last year.
"Police believe there will be people in the community who will have information."
Kamal Reddy argued he should be allowed to stay in New Zealand because his adult son lives here.
Two youths took her handbag and put her in hospital.
"Have we not learnt the lessons of where we went wrong before?"
It's believed to be linked to a traffic incident.