Thank you, Chris! Our Term setting is set to end Teacher access at term end. The course participation setting is set to Term.
Where things get interesting is the Sections page of Course Settings. On that page, the Section dates have appropriate start and end dates. However, at the top, there are course and term dates listed. The term dates are correct, but the course start and end dates both say "no date." Could that be our problem? I am not sure how to adjust that. We create courses using import files from our SIS, so I assume those dates are set by that.
It is reassuring to hear that it is supposed to function how I thought it functions. I did not verify that the faculty member deleted files from her course; I took it on her word. I will verify that she did, because I think there's a chance she thought she deleted files and in fact only deleted them from her file storage.
Thank you!