A former Mayer Brown employee says that she was illegally fired by the firm because of her age. But after months of discovery, the case has bogged down over whether Mayer Brown has the right to subpoena Mary Ellen Hindin’s previous employers for records related to her past performance.

Hindin, 58, alleges in a complaint filed in February in D.C. Superior Court that despite working as a paralegal at the firm since September 2007 and receiving positive performance reviews and raises, she was fired after the firm hired a much younger person to perform similar duties.