[2] Born in Binghamton, New York, Lynn received a Bachelor of Arts degree from University of Virginia in 1973 where she was the first woman member of the Jefferson Literary and Debating Society.

She received a Juris Doctor from Southern Methodist University Dedman School of Law in 1976.

[2] On May 1, 2016, she became the chief judge of the Northern District of Texas, the first woman to hold the position.

[2] Lynn was the presiding judge in the case of former Dallas Mayor Pro-Tempore Don Hill.

Big Idea appealed Lynn's ruling and the United States Court of Appeals for the Fifth Circuit overturned the judgement in August 2005, ruling that faxes and memos set out by Lyrick were not sufficient under the law; therefore, Lynn should have granted Big Idea's request for summary judgement.