From an early age, Fuentes showed interest in acting. When she was 12 years old, she joined the Pitri Group, a local theater troupe founded by Víctor Torres, where she performed as an actress and dancer. In a 2015 interview, Torres praised Fuentes' discipline, which he called "her best weapon to achieve what she has today". He also added that Fuentes was "dynamic, knew what she wanted, was helpful, good friend, and always had that naturality that she still preserves". During those years, she distinguished herself with imitations of Cantinflas and La India María, two popular Mexican characters.