Dear Ms. Lass,
Thank you for posting your requeston on History Hub!
Yeoman is a rating associated with secretarial work. The women would have been part of the Navy and have military personnel files. We suggest that you request a copy of her Official Military Personnel File (OMPF). OMPFs and medical records of enlisted men and women of the U.S. Navy who were separated from the service after 1885 and prior to 1958 are located at NARA's National Personnel Records Center (NPRC), (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. To request these records, please mail a completed GSA Standard Form 180 to NPRC. It is fine to write “unknown” for the service number.
We hope this is helpful. Best of luck with your family research!
[Information provided by Nathaniel Patch, Subject Matter Expert]