Prime Minister Prayuth Chano-cha had asked the ministry to proceed with the case before the period for legal action expired in February.
However, Apiradi said her ministry needed to study carefully the procedure for legal action against the six individuals as it is a sensitive case and involves a number of agencies.
The ministry said it should be able to complete all the documentation this week and then the paperwork would be ready for the case going to court.
A senior source from the Foreign Trade Department said the department was carefully studying previous corruption cases, focusing on the Klong Dan scandal as an example, as the department lacks experience in dealing with legal action involving corruption charges.
The department is discussing the matter with the Legal Execution Department and other relevant agencies so that the court action will be seen as transparent. The defendants should not be able to bring a claim against the government officials involved in this case, the source explained.
However, although the ministry is proceeding with the court case,the politicians and former government officials alleged to be involved could appeal against the verdict before their assets are seized.
The alleged G2G rice scam took place when Yingluck Shinawatra was prime minister. Officials were accused of backing a deal to sell 6.2 million tonnes of rice from government stocks. It was found that the rice deal was not genuine and led to a loss of more than Bt20 billion to the state.