I have added some sources to this family's profiles. Here is marriage record that may be for Nellie Webber:
"Maine Marriages, 1771-1907," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:F4NW-4PD : 4 December 2014), Charles H. Moore and Nellie A. Webber, 23 Feb 1888; citing Etna,Penobscot,Maine, reference ; FHL microfilm 10,847.
Hope this helps! -NGP