"Delaware Death Records, 1855-1961," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FNT9-PX9 : 2 March 2021), Elizabeth Mumford in entry for James C. Ryan, 15 Jun 1950; citing Millsboro, Sussex, Delaware, United States, Hall of Records, Dover; FamilySearch digital folder 004253050.
This person had to be born earlier than what is currently listed. If she lived from 1875-1884, she was 9 when she passed away, which is too young for most women to bear a child. The marriage document attached to her spouse’s profile states that they were married 16 March 1875, which fits a lot better with the timeline. Even if she married young, it would make her old enough to have a child by her death in 1884. I have attached the marriage document to this (previously unsourced) profile as well, both for further research and because it seems very likely to be a correct source for this person.