As a child, she made her first notable acting appearance in Travesuras del Corazón, a Peruvian soap opera. She later appeared as a primary character in several telenovelas, particularly gaining international exposure playing Paloma Velacochea in the internationally-broadcast Besos robados. She has played Maria Valentina in the telenovela La Marca del Deseo. In 2011, she released her first music album Llegaré. Cayo has played Antonia 'Toni' Fontalvo on El Secretario, Macarena González on La Hipocondríaca, and Melina on La Hermandad. She will next play Paz Garmendia on Hypno, and Alegría Llosa on God's Equation. Stephanie can currently be seen playing the role of Mary Luz Solari on the Netflix TV series Club de Cuervos.