A woman jailed for assaulting murdered toddler Nia Glassie is set to be freed.

Oriwa Kemp was found guilty of the wilful ill-treatment and assault of Nia and was sentenced to a three years and four months imprisonment in February.

Kemp gave the three-year-old cold baths and hit her when she cried. She was also present when Nia was swung on a clothes line and placed in a clothes dryer.

Having spent more than 500 days in custody, Kemp became eligible for parole soon after sentencing, The Dominion Post reported.

This month, in her third appearance before the Parole Board, Kemp was granted early release next month with special conditions.

These included being placed under electronic monitoring, completing an anger-management course, completing any other treatment or counselling deemed necessary, not drinking alcohol or using drugs, and not having contact with anyone under 16 unless an approved adult is present.

The conditions would remain in place until May, 2011.

Kemp's cousin, Michael Pearson, who was also jailed for his involvement in Nia's abuse, was denied parole earlier this month after the Parole Board ruled he still posed a risk to the community.

Brothers Michael, 22, and Wiremu Curtis, 19, were sentenced to life imprisonment for Nia's murder, with a minimum non-parole period of 17 1/2 years.

Nia's mother, Lisa Kuka, was sentenced to nine years in jail for manslaughter, failing to seek medical treatment for her daughter and failing to protect her from abuse.

William Curtis, 50, the father of Michael and Wiremu, received four years in prison for assaults on Nia.