Previously, she served as Minister of Health, Social Services and Equality of Spain from 2016 to 2018, when a vote of no-confidence against Mariano Rajoy ousted the government.

Montserrat has been regent and spokesperson of the People's Party in Sant Sadurní d'Anoia City Council since 2007, member of the Executive Committee of the PP of Catalonia and deputy for the province of Barcelona to the Spanish general election of 2008 and 2011.

[2] In May 2012, Montserrat acceded to the Deputy Secretariat for Organization and Social Action of the PP of Catalonia, in the remodeling of the leadership resulting from its 13th Congress.

[7] On 26 July 2018, was named spokesperson of the PP parliamentary group after Rajoy Government was ousted and Pablo Casado was elected president of the party.

[14] In addition to her committee assignments, Montserrat is part of the MEPs Against Cancer group[15] and the European Parliament Intergroup on Children’s Rights.