The suit was filed this month in Hinds County Circuit Court, The Clarion-Ledger reports.
Roseann Buck was hired in 2010 as executive director of the Bologna Performing Arts Center. She was diagnosed with breast cancer in May 2011. A year later, Buck says she was told her contract wouldn't be renewed. University employees who aren't professors work on year-to-year contracts.
Buck says her supervisor gave her the lowest possible ratings on her last job evaluation, even though she increased ticket sales, improved the theater's condition and didn't take extra time off for treatment.
A university spokesman could not immediately be reached for comment Tuesday.