Montaño became the director of A New Option in 2006, for whom she won a seat in the Constituent Assembly in 2007.[3] Later, she helped organize the National Democratic Coalition.
Montaño is one of the founders of the Creating Opportunities (CREO) party, organized in 2010.[4] She was elected to the National Assembly representing CREO in 2013 [es] and 2017 [es].[5] On March 2, 2018, Montaño, dissatisfied with CREO, left the party and became an independent.[6]
On June 18, 2018, under Article 131 of the Ecuadorian constitution, Montaño presented a request to the National Assembly for the impeachment of Attorney GeneralDiego García for his role in the Odebrecht scandal, backed by 37 signatures, 23 annexes, and 1467 pieces of evidence.[7] García had already resigned from the Attorney Generalship on January 31, 2018, after a decade at the post,[8] but the Legislative Administration Council, the governing body of the National Assembly, approved the request on September 18, 2018,[9] passing it to the Supervisory Commission the next day.[10]