Kira should ask for the documentation. The documentation typically provides detailed information about the software, including its purpose, functionality, how to use it, and any specific rules or guidelines for working with the codebase. This will help her understand how the program is supposed to work.
Pseudocode may offer some insights into the logic of the program, while structured functions and object files are more technical aspects that may not provide a high-level understanding of the software's purpose and usage.