Final answer:
Anne forgot to follow the step of 'Unfreezing' in the process of change.
Step-by-step explanation:
The step in the process of change that Anne forgot to follow is Unfreezing. Unfreezing refers to the process of preparing individuals or organizations for change by helping them understand why the change is necessary and creating a willingness to change. In Anne's case, she came up with a new idea for ordering missing medications, but she did not take the steps to help the nurse manager understand the need for the change and create an openness to it.