[3] In 2005, when Alonso was 16 years old, she was a member of Club El Refugio de Huerta del Rey.

[3] That year, she competed in the Spanish national championships, finishing high enough to qualify for a competition in Colorado Springs.

[2][4] In 2009, Alonso competed at the Interautonómico Spring Championship for the Blind and Visually Impaired where the S12 swimmer set a world record in the 400 meters freestyle event.

[3] In June 2012, she participated in the Castilla and León Adapted Swimming Open, which served as a Paralympic qualifying event.

[13] Prior to heading to London, she participated in a national vision impaired swim team training camp at the High Performance Centre of Sant Cugat from 6 to 23 August.