Final answer:
The nurse should focus on the affective learning domain to help the client's wife cope with the emotional burden of administering feeding tube care for her husband with end stage cancer.
Step-by-step explanation:
The nurse should direct further teaching strategies toward the affective learning domain. The affective domain involves the emotions and feelings associated with the learning process. In this case, the client's wife has demonstrated the mechanical ability to perform a task (feeding tube instructions), but is expressing emotional distress and doubt about her ability to manage this responsibility over time.
This suggests that she might benefit from support that addresses her emotional readiness and well-being, not just her technical skill set. Strategies could include providing emotional support, connecting her with a support group of others in similar situations, or considering additional respite care options to mitigate the emotional burden.