Dear Ms. Voss,
Thank you for posting your request on History Hub!
We suggest that you request a copy of her Official Military Personnel File (OMPF). OMPFs and medical records of officers and enlisted personnel of the U.S. Marine Corps who were separated from service after 1904 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. You can also fax the form to 314-801-9195 OR view the record by visiting the NPRCArchival Research Room in St. Louis, MO. Veterans and their next of kin can also use eVetRecs to request records. See eVetRecs Help for instructions. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
We hope this is helpful. Best of luck with your family research!