Mary left journalism to study law, and established her own firm as a solicitor. She works mainly in family law, appearing frequently as counsel for the Independent Children's Lawyer. She also appears regularly in Mental Health Review Tribunal inquiries and as separate representative in the Guardianship Division of the NSW Civil and Administrative Tribunal (NCAT). An experienced mediator, she maintains membership of the Australian Institute of Family Law Arbitrators and Mediators. She is a member of the family law section of the Law Council of Australia and the New Zealand Law Society.