I think Anthropic did the right thing here; but the sheriff's office are probably demonstrating why she dislikes them. Writing a diary entry to a chatbot is clearly not how this law was intended to be used.
EDIT: Actually, on reflection, making this report to the people she was upset about was probably not the right call. If they'd sent it to the FBI, there'd be a much lower chance that someone felt the need to assert their "authority".