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Dear Ms. Terstriep,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Subject Files, 1942 - 1946 in the Records of the Office of the Provost Marshal General (Record Group 389) that includes a file unit titled Detention Rosters: Camp Ellis, IL. They may contain the information you seek. For access to and/or copies of this file unit, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We hope this is helpful. Best of luck with your research!
I followed your lead and received my copy of the file today. It's wonderful and has prompted further questions I'll be looking into. Thank you for the information.