She is the niece of longtime Bsharri MP, Dr Gibran Taouk. In her teens, Sitrida was renowned for her beauty, which made her a media favorite in Lebanon. Her political activism began while at the Lebanese University, and it led to meeting the leader of the Lebanese Forces (LF), Samir Geagea whom she later married.

She is better-known for being one of a few politicians to publicly criticize the presence of the Syrian army in Lebanon during the Pax Syriana over Lebanon from 1991 to April 2005, when Syrian troops withdrew from Lebanon as a result of international pressure and the Cedar Revolution. She also became the sole voice of the party during Geagea's decade-long political imprisonment. She led the LF in his absence and worked with other mainly Christian Lebanese parties such as the Qornet Chehwan Gathering and the Free Patriotic Movement for his release, which finally happened on July 26, 2005.

Sitrida Geagea was elected to the Lebanese Parliament in 2005 as Bsharri's MP, along with Elie Kayrouz.