Grice arrived from New Zealand on Saturday and begins work on Monday morning.
She will hear a wide spectrum of cases, including three criminal jury trials and criminal sentencing sent over from Aitutaki.
Criminal charges being heard range from threatening to kill and assaulting a female to burglary and being unlawfully found on property.
The judge will also hear a number of civil cases, including John Tini’s claim of $121,631 against Cook Islands Investment Corporation, where he was formerly chief executive.
Grice is a past president of the New Zealand Law Society and is former chair of Radio New Zealand and Te Pou, New Zealand’s National Centre of Mental Health Research.
She was appointed this country’s first female judge in June 2007, with Justice Judith Potter the second, appointed in August this year.