Beginning her career as a teacher, Álvarez took photographic assignments for magazines and newspapers, developing a reputation as one of the only women photojournalists working in Mexico City. She chose to portray subjects candidly, revealing the deeper meaning of culture and social significance, rather than seeking newsworthy work. In 1935, she began cataloging photographs in the Department of Education and two years later was hired to run the photography workshops of the National Autonomous University of Mexico, where she remained until her retirement in 1971.