[4] Following a UD win against Ana Cristina Vargas in a non-title fight in April 2016,[5] she faced former foe Alondra Garcia for the vacant WBC Youth female light flyweight title on 4 June at the Gimnasio Usos Múltiples UdeG in Guadalajara, Mexico.

[6] In her next fight she successfully defended her Mexican title in a rematch with Brenda Ramos in October[7] before challenging WBO female flyweight champion, Nana Yoshikawa, on 29 April 2017 at the Big-i in Sakai, Japan.

[8] After a UD win in a non-title fight against Yesenia Martinez Castrejon in December, she made the first defence of her title against former two-time world champion Arely Muciño on 17 February 2018 at the Domo del Parque San Rafael in Guadalajara.

[9] For her next fight she dropped down in weight to face Mayela Perez for the vacant WBA female atomweight title on 31 August 2018 at the Arena Pavillón del Norte in Saltillo, Mexico.

[10] Alarcón lost her title on 5 August 2023, suffering a majority decision defeat to WBO champion Yuko Kuroki at Central Gym, Kobe, Japan.