In 1880, Sarah is found in the Edward Dunn household. Edward is living with his two daughters, Isabella and Mary and Mary's family, husband John and daughters Catharine, Sarah and Isabella. Given that Mary and her husband named one daughter after Mary's mother, the other after Mary's sister, and the third is named Sarah, I'm wondering if Sarah Heller might be Edward Dunn's daughter.
Sources
"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWJF-WB8 : accessed 24 Oct 2014), Sarah Heller in household of Edward Dunn, Philadelphia, Philadelphia, Pennsylvania, United States; citing sheet 84D, NARA microfilm publication T9.
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