In 1924, she graduated from Laredo Business College. That was a huge accomplishment since it was rare in that time for Mexican-Americans to graduate from high school. She set out to work to end discrimination and improve the lives of many Latino families.
She became the first woman in 1937 to hold a national office with the League of United Latin American Citizens, better known as LULAC. In 1937, she also became the first woman to serve on the board of LULAC News. Montemayor also helped start the Junior LULAC.
According to the Intercultural Development Research Association:
The National Women's History Project
The Intercultural Development Research Association