In her professional capacity as a counsellor and hypnotherapist, Lyndall has been in full-time private practice for over 20 years. Her clinic is in Kingsgrove. She has been on the board of the ACA since its incorporation. She is Chair of the College of Counselling Hypnotherapists, and is president of the Australian Society of Clinical Hypnotherapists (ASCH), where she has been on the board continuously since 1998. She is a registered supervisor with both the ACA and the Australian Society of Clinical Hypnotherapists (ASCH).