Born in 1957 in Omsk, Russia. 1976 - graduated from Vilnius 21 secondary school. 1978 - graduated from Vilnius Four-Year Adult School. 1981-1984, 1985-1992, 1994-2014 L. Janavičienė worked as a prop artist in Vilnius Lėlė Theatre; since 2014 - theatre artist-prop designer. From 1984 to 1985 she worked as a prop sculptor at the Lithuanian Academic Drama Theatre (now the Lithuanian National Drama Theatre). From 1993 to 1994 she was the head of the puppet theatre of the children's club "Liepsnelė".From 1988 to 1994 she acted and created performances in the family theatre "Marijos teatras". From 1985 to 1992, she taught puppet theatre technology at the Vilnius School of Culture (now Vilnius College) and from 2008 to 2010 at the Lithuanian Academy of Music and Theatre. 1995 - 1998 as a performer and artist participated in the creative activity of Vega Vaičiūnaitė's environmental theatre "Miraklis".
L. Janavičienė has collaborated with Vilnius Old Town Theatre, Kaunas State Puppet Theatre, Klaipėda Drama Theatre, State Youth Theatre, Lithuanian Russian Drama Theatre and Lithuanian National Opera and Ballet Theatre, where she has created set designs for performances and consulted the creators on puppet theatre technologies.