Answer by taking a quote from the following article:

Ann Margaret Veneman (born June 29, 1949) was the Executive Director of UNICEF from 2005 to 2010. Her appointment was announced on January 18, 2005 by UN Secretary-General Kofi Annan. Previously, Veneman was the United States Secretary of Agriculture, the first, and as of 2018 the only, woman to hold that position. Veneman served as USDA Secretary from January 20, 2001 to January 20, 2005, leaving to become the fifth executive director of UNICEF.

Veneman began her legal career as a staff attorney with the General Counsel's office of the Bay Area Rapid Transit District in Oakland, California, in 1976. In 1978, she returned to Modesto, where she served as a Deputy Public Defender. In 1980, she joined the Modesto law firm of Damrell, Damrell and Nelson, where she was an associate and later a partner.  Veneman joined the United States Department of Agriculture's Foreign Agricultural Service in 1986, serving as Associate Administrator until 1989. During this time she worked on the Uruguay Round talks for the General Agreement on Tariffs and Trade (GATT). She subsequently served as Deputy Undersecretary of Agriculture for International Affairs and Commodity Programs from 1989 to 1991. From 1991 to 1993, she served as United States Department of Agriculture's Deputy Secretary, the first woman appointed as the Department's second-highest-ranking official. At this point Veneman took a break from political and administrative office to practice with the law firm and lobby group Patton, Boggs & Blow and also served on several boards of directors and advisory groups.  In 1995 Veneman re-entered government, when she was appointed Secretary of the California Department of Food and Agriculture, again being the first woman to hold the position. From 1999 to 2001 Veneman was an attorney with Nossaman LLP, where she focused her attention on food, agriculture, environment, technology, and trade related issues. On 20 January 2001 she was unanimously confirmed by the United States Senate and sworn in as Secretary of Agriculture, a position she held until January 20, 2005.

Did she move into politics after that job?
joined the Modesto law firm of Damrell, Damrell and Nelson, where she was an associate and later a partner.