In January this year, just before a visit by the Ministry of Education, a child was found unattended in an alcove just inside the building and eating food from a plastic bag.
The last incident involved children being left unattended on a deck. That resulted in an employment disciplinary process. A few days later Hackett resigned.
The New Zealand Teachers Disciplinary Tribunal said it was impressed by the way Hackett gave evidence and felt she "was capable of reflection of her practice and therefore ongoing development and maturity".
"The events that were the subject of this charge have been a very steep learning curve for her, and it is indeed fortunate that there were no more serious consequences for the children concerned.
"We accept [Hackett] was truly shattered by events."
Neither Hackett's lawyer nor the Complaints Assessment Committee felt Hackett's conduct amount to serious misconduct, and the tribunal only found the charge relating to the September incident proven.
However, the tribunal found it did not amount to serious misconduct.
"We have found that [Hackett] failed to take adequate steps to ensure children were supervised on one occasion. Therefore her conduct fell short of the stanard expected of a centre manager and we find it amounts to misconduct."
The tribunal placed a condition on Hackett's practising certificate that she not undertake a leadership role for three years.
She was also ordered to pay 20 per cent of the investigation's costs.
Hackett had no plans to take up a leadership role.