Final answer:
There is no information provided about when Judy became Head Choreographer. References are made about the stage and dance, but specifics about her career are not available in the given text.
Step-by-step explanation:
Based on the provided information, there is no specific mention of when Judy became a Head Choreographer. The excerpts refer to various figures and scenarios related to performances and the stage, but do not contain clear details about Judy's career timeline or her appointment as Head Choreographer. Therefore, it is impossible to determine from the given passages when Judy took on the role of Head Choreographer. However, we can deduce that Judy is connected to the world of performances and possibly dance, as there are references to costume and theatrics, which are integral to choreography.