Final answer:
The nurse in the scenario is demonstrating the principle of beneficence. She is acting in a way that benefits the client by telling the truth, keeping promises, and preventing harm, thus ensuring the client's well-being.
Step-by-step explanation:
The nurse is demonstrating the principle of beneficence, which implies acting in ways that benefit others, in this case, the client who is experiencing conflict with his family. By telling the truth, keeping promises, and doing no harm, the nurse is ensuring that her actions contribute to the well-being and best interests of the client. These actions clearly align with the ethical precept of doing good, or beneficence, rather than the principle of autonomy, which refers to respecting a patient's right to make their own healthcare decisions. While respecting client autonomy is vital, the scenario does not specifically indicate that the nurse is honoring the client's autonomy, but rather emphasizing the nurse's ethical obligations to do good, keep promises, and prevent harm.