In this situation, the most appropriate response would be: Nothing—there are setbacks that one cannot control.
Nala had a solid plan and landed the job she wanted, but unforeseen circumstances, like staffing changes, can happen in any organization. It's important to acknowledge that sometimes external factors, such as company restructuring, are beyond an individual’s control. Instead of focusing on what she could have done differently, it would be more beneficial for her to adapt and look for new opportunities or ways to enhance her skills for future positions.