Nellie is in the 1880 Federal Census as N. R. Wolfendale with her infant son Harold, living in Providence, RI, with her parents.
Nellie P. Remington married Lewis N. Fidler, on 8 Feb 1887. As her maiden name was used for this second marriage, I am not sure whether she was divorced, or whether her first husband died.
The RI Cemetery Database has her date of birth as 22 April 1857. However, the Providence City Records have it recorded as 6 May 1857.