I'm not a lawyer, but I'd read what the therapist said a little differently. Instead of, "Don't talk to your daughter about this b/c you will be breaching confidentiality and that is wrong" I wonder if she was saying, "Don't talk to your daughter about this b/c I [the therapist] have broken confidentiality and could get in trouble for doing so."

Breaking confidentiality by a therapist can have at least two significant consequences:

1. They may lose the trust of the counselee. The daughter is unlikely to trust the therapist again if she knows the therapist betrayed her confidence.

2. They may be censured (or worse) by their employer, by professional organizations, by the state, etc.

Dave