Yashi was born in Berlin and completed her studies at the University of Fine Arts / Berlin in 2000 in the class of Prof. Martin Rupprecht and Vivienne Westwood.
She works as a freelance costume and set designer for theater, opera and film with different directors such as Adriana Altaras, Daniel Schmid, Hans Neuenfels, Jean-Yves Courregelongue, Dimitris Papaioannou, Marie-Ève Signeyrole and Robert Wilson.
In 1999 she met the American director Robert Wilson during a stay at the Watermill Center / NY and since then she has been working as a costume designer for him in numerous productions such as Krapp's Last Tape,The Odyssey, Katya Kabanova,1914 and La Traviata.
With Marie-Eve Signeyrole she collaborated on the creation of Eugene Onegin, Owen Wingraves, Cendrillon, Il Tabarro / Royal Palace and La Soupe Populaire.
In 2009 she received the Hein-Heckroth Prize for stage design and in 2016 she was nominated for the Emmy awards for „ Outstanding Costumes/ Styling „ for the First European Games in Baku 2015.
In 2017 she is awarded for the Golden Mask in Moscow for the costumes of La Traviata , direction Robert Wilson.