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Dear Ms. Sileo,
Thank you for posting your request on History Hub!
The Federal Government does not ordinarily create or maintain birth, death, marriage or divorce records. Such records are made and kept by State and local governments rather than the National Archives.
For vital records such as birth and death records, please contact the Pennsylvania Department of Health for Vital Records at https://www.health.pa.gov/topics/certificates/Pages/Vital%20Records.aspx. Her obituary may have been published in one of the Philadelphia newspapers. And you may search the Social Security Death Index that is available for free on Family Search at https://www.familysearch.org/search/collection/1202535.
We hope this information is helpful. Best of luck with your family research!