[3] In May 2014 she was selected, along with Polina Berezina, to represent Spain as a senior individual in the Corbeil-Essonnes World Cup, where she competed for the first time as a member of the national team, finishing 45th in the All-Around.

As of September 2014, he went on to train at CEARD under the orders of Ruth Fernández, along with other international individual gymnasts of the team, such as Carolina Rodríguez, Sara Llana and Andrea Pozo.

[5] In April 2015, Alonso competed at the Copa de la Reina in Guadalajara, where she won bronze in team, hoop and ball, and silver with clubs.

[7] On October 5, 2015 it was confirmed that Alonso was incorporated into the senior Spanish team in the CAR of Madrid under the orders of Anna Baranova and Sara Bayón, training with the successful generation of gymnasts known as the Equipaso.

[8] On July 23, 2016, Mónica made two exhibitions with the Spanish junior team at the 20th Anniversary Gala of the Gold Medal in Atlanta '96, held in Badajoz.

The team consisted of Mónica, Victoria Cuadrillero, Clara Esquerdo, Ana Gayán, Lía Rovira and Sara Salarrullana.

[14] Since the Guadalajara World Cup the Spanish team was formed by Mónica, Victoria Cuadrillero, Clara Esquerdo, Ana Gayán, Alba Polo and Lía Rovira.

In March 2018, the team began the season at the City of Desio Trophy, disputing a bilateral match with Italy in which they won silver.

The group in this championship was formed by Alonso, Victoria Cuadrillero, Clara Esquerdo, Ana Gayán, Alba Polo and Sara Salarrullana.

Doctors Manuel Leyes and Tomás Roca performed an arthroscopy on her right foot, intervening a trigonum that irritated the flexor hallucis longus muscle.