She told reporters that she was drafting a statement of defence to be sent to the Office of Ombudsman.
The office has launched an inquiry into the ethical conduct of the prime minister and set a 30-day deadline for Yingluck to submit her defence.
Chief ombudsman Panit Nitithanprapas said Tuesday that Yingluck would have to explain her private meeting held on February 8 at the hotel after advocacy group, Green Politics, filed a complaint with the ombudsman seeking an inquiry.