Hi @Greg Laird ,
I have something to confirm with you.
- The version of SharePoint, SharePoint Online or SharePoint Server?
- How did she perform the search? Search by file name or metadata or anything else?
- If you are in SharePoint Server environment, did you perform a full crawl after re-indexed? If you are in SharePoint Online, you may need to wait for several hours even up to one day after re-indexed until the crawl is performed in the backend.
- Did any error message appear after searching? Or just "couldn't find any results" prompts?
- What is the scope of files cannot return search results? A specific file or all files in that library?
- Do this issue happen in other libraries?
- Go to Library settings -> Advanced settings -> Make sure that Allow items from this document library to appear in search results? is set to Yes.
Please also take a reference to below articles to help you troubleshoot.
Search results missing in SharePoint Online
SharePoint Online doesn't return search results
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