 She belongs to Jubilee Party after leaving ODM party and was elected to represent the Starehe Constituency in the National Assembly of Kenya since the 2007 Kenyan parliamentary election.She risked losing her parliamentary seat after a vote recount carried out in 2010 indicated that her opponent Maina Kamanda (PNU) won the election with a clear margin.As a result, a by-election was held on September 20, 2010, but Wanjiru retained the seat beating Kamanda.