After graduating in Film and Television Production from the University of Westminster, Weissmahr worked on various documentary projects until she made her acting debut in the award-winning feature film Júlia Ist by Elena Martín Gimeno.   In the theatre world, she has worked with artists such as Carlota Subirós, Nao Albet and Marcel Borras as well as Ferran Dordal amongst others. She is part of the VVAA collective, with whom she co-wrote and co-directed ARCAS 2020 (Teatre Lliure de Montjuïc, Barcelona in 2021, Teatros del Canal, Madrid in 2022, Teatro Calderón, Valladolid in 2021). She has formed part of the cast as an actress, singer and creator in their performance PUSSY PICNIC (La Infinita De L'Hospitalet in 2019, The Orange Garden, Rome in 2019) and in the plays WOHNWAGEN (winner of the BBVA Award 2018) and LIKE SI LLORAS (Sala Beckett, Barcelona, November 2017, and Roter Salon, Volksbühne, Berlin, 2017). Their latest play as a collective, BABY NO MORE, will premiere at Teatre Nacional de Catalunya in May 2024. She has appeared in several projects by Jordi Colomer, such as ÚNETE! JOIN US! (2017) for the Spanish Pavilion at the 57th Biennale di Venezia and NEW PALERMO FELICISSIMA! for MANIFESTA12 in Palermo. In February 2018, they premiered THE SPANISH COAST at ARCO Madrid, a 4-hour daily performance in 9 languages, which they will present again at MACBA in 2024. In the world of film, she has appeared in TV series such as Cardo (Atresmedia, 2022), La Ruta (Atresmedia, 2022), Fanático (Netflix, 2022), DRAMA (Playz, 2020), as well as short films like GANG (nominated at the Málaga Film Festival 2020) and the feature film L'Ofrena (2020) by Nanouk Films. As a voice-over artist, she has worked for brands such as Benetton, Skeyndor, Oppo, Oysho and more. She is fluent in Spanish, Catalan, German, English, Italian and French.