In a response to an Official Information Act request from the Herald, the ministry said a comprehensive report in March found there was no substance to the complaints and Ms Craill's job at the school was done.
The complaints addressed issues including a lack of respect, poor student achievements, inconsistency dealing with disciplinary matters, bullying and high staff turnover.
Ms Craill was appointed in October 2010 and finished on September 16.
Alison Adlam, an acting senior manager for the ministry, said in the information act response that the manager had not investigated any issues since completing the review in March.
However, a ministry spokesman told the Herald at the end of last month that she was still investigating specific complaints.
The recent mouth-taping complaint is being handled by the board of trustees and the ministry has said it will act only if parents are unsatisfied with the response from the board.
Labour Party education spokeswoman Sue Moroney said parents were still in the dark. "They have had no official feedback about what is happening, the investigation, where it is at and what the conclusions are."
Last night, Mrs Tolley said: "Parents need to be confident that their children are being taught in a safe environment. I have asked to be constantly updated on this issue."