Graças Foster as the Transportadora Brasileira do Gasoduto Bolivia-Brasil. In 1998, Foster was working for a Petrobras unit that was involved importing natural gas from Bolivia. During this time, she met Dilma Rousseff, who in October 2010, would be elected to serve as the first female President of Brazil. In 1998, Rousseff was a relatively unknown energy official, serving in Rio Grande do Sul in southern Brazil. Foster and Rousseff developed a lifelong professional relationship, based in their mutual support of the leftist Workers Party, which rose to power in 2002, resulting in the election of Luiz Inácio Lula da Silva as
Dilma Rousseff later reconciled and remained together until 2000, when Rousseff moved alone to a rented apartment. In 1995, after the end of Collares' term, Rousseff departed from her political office and returned to the FEE, where she was the editor of the magazine "Economic Indicators" (). It was during this break from public offices that she officially enrolled in the Campinas State University PhD program, in 1998. That same year, the Workers' Party won the Rio Grande do Sul gubernatorial election with the support of PDT in the second round. Once again she was appointed Secretary of Energy, this time by