Final answer:
The RN should ask the AP if she needs assistance.
Step-by-step explanation:
The RN should take action by asking the AP if she needs assistance. This step is important because it allows the AP to explain why the task was not completed and whether they need help. By clarifying the situation, the RN can determine the appropriate course of action, which may include providing assistance or assigning the task to someone else.
The other options listed, such as completing an incident report, delegating the task to the PN, or notifying the nurse manager, may not be necessary at this point since the first step is to communicate with and understand the AP's perspective.