 She was one of the three members of the Local Government Commission from 1 April 1990 until 31 March 1993, along with Sir Brian Elwood and Doug Pearson.Rejoining Statistics New Zealand in 2001, she was appointed General Manager, Maori Statistics.Wereta was a member of the five-person 1985-86 New Zealand Royal Commission on the Electoral System that recommended mixed member proportional representation (MMP) for elections to the New Zealand Parliament, a major change from the previous first-past-the-post system.