Dear Ms. Horne,
Thank you for posting your request on History Hub!
For Air Force (including Army Air Corps), Army, and Navy personnel, NARA's National Personnel Records Center will verify the awards to which a veteran is entitled and forward the request with the verification to the appropriate service department for issuance of the medals. For requesting medals and awards, please use eVetRecs on NARA’s website at https://www.archives.gov/veterans/evetrecs/ or complete a GSA Standard Form 180 and send it to NARA's Military Personnel Records, National Personnel Records Center, 1 Archives Drive, St. Louis, MO 63138-1002. Provide as much information as possible in Section II under "other." For information on how to request replacement medals, please refer to the NARA website here: Military Awards and Decorations.
Due to the COVID-19 pandemic, the NPRC was closed from March 23 through June 23, 2020. As of June 24, the NPRC entered into Phase One of a gradual reopening process. On October 5, NPRC entered Phase Two. The center currently is only servicing emergency requests associated with medical treatments, burials, homeless veterans, VA Home loan guarantees, and employment opportunities. If this is urgent, please see Emergency Requests and Deadlines. We apologize for any inconvenience.
We hope this is helpful.
Since the NPRC isn't working on replacement medals right now, your best bet would be buying them from a commercial source or private vendor. The ones issued by the Army are free, but they normally take several months to a year to receive those replacements.