By relieving her entire fight with her client, Nancy is demonstrating her lack of discretion by sharing a personal issue with a client.
In simple terms, discretion refers to an individual choice or judgement regarding something. It is the power or right to decide or act according to one's own judgment. Professional discretion refers to the organizational expectation from its employees to be able to source and assess the information necessary to perform a certain task or decide on a specific course of action. In most cases, professional is expected to not reveal their personal issues and conflict to clients (unless required by the situation as in case of therapist). By reliving her fight with her client, Nancy demonstrates her lack of discretion by sharing a personal issue with a client.
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