She represented Spain at the Miss Atlántico Internacional 2014 pageant, where she was eventually declared as the winner, crowned by outgoing titleholder Lorena Romaso.

[6] At the end of the event, she was crowned Miss World Spain 2015 by her predecessor Lourdes Rodríguez of Castilla-La Mancha.

[9][10]By the end of the event, Lalaguna was crowned Miss World 2015 by the outgoing titleholder Rolene Strauss of South Africa.

Lalaguna's win marked the first time Spain won the Miss World competition,[11] since the pageant's inception in 1951.

Through her work in fashion, media, and philanthropy, Mireia continues to be a significant figure in the global entertainment industry.