I have a Bertha Medora Delano, b. 19 May 1845 in Beekmantown, Clinton, NY, d. 2 Oct 1883 in Clifford, KS. She married 12 Feb 1865 in Stockholm, NY to Isaac Clinton Towne, b. 17 Jul 1846 in Moira, Franklin, NY, d. abt 1884.
Bertha Medora Delano was the youngest of seven children that I know of for Frederick A. Delano, b. 3 Aug 1787 in possibly Ballston, Saratoga, NY or Grand Isle Co., VT and his second wife Caroline Pixley.
I was not aware of any other children in this family, however the birthdate you give, 11 Aug 1847, would fit nicely.
Let me know if you think there may be a connection.