She earned a master's degree in International Affairs from New York's Columbia University in 1986, after being granted a Fulbright Scholarship.

[5] When Gallach first met Javier Solana in the early 90’s, she was based in Russia as the Foreign Correspondent for the Spanish News Agency (EFE) covering the last years of the Perestroika.

Gallach was with the Council of the European Union as Head of the Public Relations Unit in the Directorate-General for Information and Communication.

[7][8][9] The decision was met with protests from UN staff members who stated in their petition to UN Secretary-General Ban Ki-moon that the character is "not culturally encompassing or sensitive", and served to objectify women.

[9] In July 2018, she was appointed High Commissioner for the 2030 Agenda of Spain, a new office created this year to coordinate the actions of the Government to accomplish with the UN Sustainable Development Goals.