She is considered the first female Spanish film director for her silent film Thais. At the start of her career, she was a vaudeville artist, working in the theatres on Paral·lel at the turn of the century. From 1909 onwards, she simultaneously collaborated with Adrià Gual's Intimate Theatre, and she discovered the work of Margarida Xirgu, who was a reference for her. She enriched her experience in show business by performing with the Enric Borrás and Josep Sanpere companies, in roles that gave her public recognition, including La mujer desnuda (The Naked Woman), by Henry Bataille. Although a theatre named after her was built in Via Laietana in 1918, it was never inaugurated. Her connection to cinematography began early on, in 1916, when she worked with Studio Films. She worked as a film director and producer, but unfortunately, no copy of her film Thais has been conserved.
Plaça de Montserrat Casals, dedicated to her memory, is near the Llacuna metro station.
She is considered the first female Spanish film director for her silent film Thais. As an actress, she was associated with vaudeville and the theatres on Paral·lel, and she gained popularity with works like Henry Bataille's The Naked Woman.