Stage designer, actor and director. She organises puppetry workshops. In 1990, she moved to Paris. There, in 1997, she founded the theatre troupe Miettes de Spectacles. She collaborated with François LAZARO for the Dead Words production. She is responsible for the following puppet productions: Hopscotch (1999), Theatre of Twisted Things (2000), Wild Light (2002), Professeur Galopin, based on a text by Roland Topor. Saint Proutto (2002), L’Ambigu (2003) and Alice au pays des lettres (2005) were all inspired by Topor’s oeuvre. Jeznach founded the Portable Museum of Children’s Drawings (2007). In 2009, she produced the ecological performance Tête à Terre, in 2011 – Le bureau des rêves perdus, based on Agnieszka Taborska’s book, in 2012 – another ecological production Nouvelles du Mondes, and in 2014–15 – Un monsieur tout froissé.
Her productions were shown in numerous festivals in France, including Clastic Théâtre, Marionnettes en Chemins, the Paper Theatre Festival, the Northern Star Theatre Festival, le Théâtre du Grand Parquet and the National Scene of Dieppe as well as the Animator Festival in Poznań (2011), Lalka też człowiek festival in Warsaw (2012/13) and Animo Festival 2012/13 in Kwidzyn.