In the late 1990s, she appeared in , , , and.
Her first film role was alongside in the 1992 crime drama film.
In 2007, she starred in , for which she was awarded the Special Recognition Best Actress Award at the.
Both pilots were rejected by their networks.
She studied writing and theater at a local school for the arts until.
In an attempt to fight against after her performance, Janssen began seeking out more intriguing support roles, appearing in 's , 's , 's , and 's , her co-star in Monument Ave.
Janssen had a recurring role in the crime thriller television series , appearing in 9 episodes throughout the series, beginning her role in season two of the show and concluding it in the series finale.
She played in 1995 , in the 2000—2014 , on , and Lenore Mills in the 2008—2014.