The Ministry for Children's deputy chief executive, Alison McDonald, has previously said the worker was suspended.
"We are appalled at the allegations, which are shocking and deeply upsetting," she said when the Herald first reported the case.
"We are working with the young person and their family to do all we can to make sure they get the support they need."
Oranga Tamariki would also conduct an internal investigation, McDonald said.
"We are undertaking our own response, which includes a review, and an assessment of other children they were working with to ensure their safety."
The spokesman would not comment on the review yesterday.
Following publication of the Herald's story this morning, however, the spokesman said the woman's employment with Oranga Tamariki has ended as a result of the allegations.
Oranga Tamariki is responsible for the protection and care of children whose wellbeing is deemed to be at risk, youth offenders and children of the state.
In a separate case, a former Child, Youth and Family (CYF) caregiver faces allegations of sexually abusing 17 boys.
The Auckland man, who has interim name suppression, has pleaded not guilty to 43 charges.
Oranga Tamariki - formerly CYF - is understood to be investigating those claims.
The ex-caregiver's alleged offending stems from the mid-2000s and came to light last year.
Of the 17 complainants, 14 were allegedly sexually abused and others were subjected to physical abuse while the man was working for CYF.
One boy was also allegedly assaulted with a bamboo stick.
He also faces allegations of threatening to kill other boys and is charged with supplying methamphetamine and cannabis to youngsters.
