A nurse is wоrking with а client whо is in pоstoperаtive dаy 2 following a total knee replacement. The client has briefly mobilized using a wheeled walker and with the assistance of the physical therapist. However, the client is reluctant to progress further with mobilization for fear of injuring herself. In response to this, the nurse has liaised with the physical therapist to create a plan of care that creates specific goals for the client's mobility. In doing so, this nurse has exemplified what role?