She was recruited to the Liberal Party of Canada and ran for the House of Commons of Canada as candidate for the
Quebec riding of
Laval East in 1993, but lost to
Maud Debien. In 1997, Folco won the federal Liberal nomination for the riding of
Laval West. There, she was elected in the 1997 and 2000 general elections, then reelected in 2004, 2006, and 2008 for the newly-formed riding of
Laval—Les Îles. From 1999 to 2003 she represented the Canadian Liberal Party at the
Liberal International, where she was elected treasurer, then vice-president. After serving five terms as MP of Laval-Ouest and Laval-Les Îles, Folco retired from politics in 2011, choosing not to run in the 2011 general elections. During her time in Parliament Folco has held several leadership roles that have focused on immigration and women: elected vice-chair of the Permanent Committee on Immigration, chair of the Liberal Caucus on immigration, co-chair of the Women's Day at the Liberal Party National Congresses 2003 and 1994. From 2004 to 2011 she was elected chair of the Standing Committee on Human Resources. In 2000 she was appointed Parliamentary Secretary to the Minister of Human Resources, with special emphasis on immigration and labour markets and chaired the Quebec Liberal Caucus. In opposition, she was named Official Opposition Critic for immigration from 2006 to 2007 and travelled extensively to advocate for greater coordination between federal and provincial legislations and regulations on labour market and immigration. She was frequently called upon to deal directly with foreign governments, as chair of the Parliamentary Association for the Caribbean, and from 2006 to 2011 as Official Liberal Critic for
La Francophonie. She was elected vice-chair of the Inter-American Parliamentary Group on Population and Development (IAPG) where, under her chairmanship, the Canadian Association of Parliamentarians for Population and Development (CAPPD) organized and hosted the 2010 Global Annual Parliamentarians' Summit: Balancing the Scales of Women's Lives in the Countdown to 2015. == After politics ==