The Philadelphia marriage index includes a Clara Pauline Freas who married Charles Jefferson Andrews in 1891. The marriage record might have info on her parents. Check with the Philadelphia County Register of Wills Office.
Her death certificate would have been filed with the PA Div. of Vital Records. It should have her parents' names. Check with the Delaware County Historical Society to see if they help you find her obituary. If nothing else it may have surviving siblings listed.