[1] In the early 1950s Jack O'Brien began training female wrestlers, including Isabela Romero, in his gym in León, Guanajuato.

[3][4] Over the years Romero had a long running storyline feud with Irma González, which included several Lucha de Apuestas matches between the two.

[5] Romero ended up winning the mask of Princesa Azul, as a result of her Lucha de Apuestas victory on November 1, 1975.

[7] On February 25, 1979, Irma González defeated Romero in their fourth and last Lucha de Apuestas match, on a Universal Wrestling Association (UWA) show.

[8] The championship change led to a Lucha de Apuestas between the two as well, with Vicki Williams pinning Romero, forcing her to be shaved bald afterward.