Noted for her punching power and also as one of the first American fighters to incorporate low kicks into their arsenal, Casillas retired undefeated in 1986.

[4] Later that year, on December 23, she beat Irene Garcia to take the WKA Women's World Bantamweight (-53.5 kg/117.9 lb) title in Las Vegas, Nevada.

Initially, it was announced that Wheeler won on the judges' scorecards to take the WKA bantamweight title but it was later overturned to a win for Casillas.

[9] Casillas has spent the years following her retirement from competition developing her own eclectic martial art of Shen Chun Do, "the way of the warrior spirit".

Originally a student of taekwondo and full-contact karate she earned a 3rd degree black belt in Kenpo as well as Kodenkan Jujitsu.

She later studied Jeet Kune Do under Sifu Dan Inosanto and Arnis under Grandmaster Bobby Taboada and her husband Sensei Ernie Boggs.