Final answer:
The nurse is using the Betty Neuman's Systems Model, which views the patient as an open system interacting with both internal and external environmental stressors and focuses on the use of nursing intervention for wellness.
Step-by-step explanation:
The nurse views the patient as an open system that needs help in coping with stressors. The theorist that the nurse is using is Betty Neuman. Betty Neuman's Systems Model focuses on the response of the patient system to actual or potential environmental stressors and the use of several levels of nursing prevention intervention for attaining, and maintaining optimal client system wellness. Neuman's model is predicated on a comprehensive approach to client care, recognizing the importance of the stressors from the internal, external, and created environments and the nurse's role in helping patients cope with these stressors through the use of prevention strategies.