[2] Notable performances at the Vanemuine have included roles in works by such varied international authors and playwrights as: Shakespeare, Chekhov, Johann Wolfgang von Goethe, T. S. Eliot, Molière, Maxim Gorky, Ion Druță, Friedrich Schiller, Witold Gombrowicz and Arthur Miller, among others.
[2] Roles in productions of Estonian authors and playwrights include: Lilli Promet, Oskar Luts, August Kitzberg, A. H. Tammsaare, Karl Ristikivi, and Mart Kivastik.
[2] Loo made her film debut in the 1975 Virve Aruoja and Jaan Tooming-directed drama Värvilised unenäod for Tallinnfilm.
Other prominent film roles include Proua Fisch in the 1989 Peeter Simm-directed drama Inimene, keda polnud; Kristiine in the 1990 Jaan Kolberg-directed drama See kadunud tee, starring Tarmo Koidla; Teresa in the Rainer Sarnet-directed science fiction film Kass kukub käppadele: Pauli laululaegas, starring Taavi Eelmaa; and as Mare Nurk/Vanaema in the 2005 Rainer Sarnet-directed thriller Libahundi needus, starring Katariina Lauk.
[5] Loo has also appeared in a number of feature-length, made-for-television films, including the 1970 Virve Aruoja-directed historical drama Kolme katku vahel, which starred Georg Ots, Ants Eskola and Ants Lauter; she also appeared in the 1978 telefilm musical Imelugu, directed by Irene Lään.