Before joining "Riverdale," Mendes appears in theater productions and short films while studying acting at the New York University Tisch School of the Arts. She participates in a variety of stage performances, including dramatic and contemporary works, which provide early professional training and experience working with ensemble casts. Mendes also takes part in student films, university showcases, and workshops that help her gain exposure to different roles and performance styles.

Mendes also appears in independent film projects and commercial work prior to "Riverdale," giving her experience with various directors, production styles, and on-camera techniques. She works on both dramatic and lighter material, building a diverse portfolio that includes short films, feature films, and guest appearances on television series. These experiences contribute to her familiarity with both television and film production processes.

Outside of acting, Mendes is interested in photography, traveling, and visual arts. She participates in fitness activities, including yoga and running, and engages in creative workshops and projects to further develop her artistic skills. Mendes also takes part in public events, panels, and interviews related to her work in the entertainment industry.