William and Elma (Steinmetz) Cooper, parents
Helen was the only child of William and Elma (Steinmetz) Cooper from Lena, Illinois.
There is a discrepancy in Helen's birth year between Find a Grave (1880) and the Lena Park Cemetery Transcription (1882). There are also indicators she may have been married but it appears to be confusion with another Helen Cooper married to Henry Sayer, who was still alive in 1910.
Chicago Tribune (Chicago, Illinois) · 1 Jan 1904, Fri · Page 2
Find a Grave https://www.findagrave.com/memorial/90562819/helene-cooper
The Stephenson Farmer (Lena, Illinois) 26 Feb 1953, Thu Page 5 (Obituary of Elma Steinmetz Cooper)
Illinois, Stephenson County, Lena Park Cemetery Transcriptions, 1854-1983. Salt Lake City, UT, USA: FamilySearch, 2019.
Year: 1900; Census Place: West Point, Stephenson, Illinois; Roll: 346; Page: 12; Enumeration District: 0110