In the late 1990s she was asked to be the legal advisor to the parliamentary group of the CDS-PP, in the Assembly of the Republic.
[1][2] In the 2002 legislative elections the CDS-PP included Caeiro on the Lisbon constituency list of candidates to be a deputy in the Assembly of the Republic.
In 2004, under the new prime minister, Pedro Santana Lopes, she was appointed Secretary of State for Arts and Performances.
[1][2] Caeiro was involved with a charitable organization called Raríssimas, that aimed to help people with rare mental illnesses.
Caeiro had been a member of the governing body at the time, although the extent of her actual involvement with the charity was disputed.