Hi, I was up at the courthouse today with your request in hand...and found very little on your girl...I found a lot on James' second wife, Rebecca Stewart, and their brood...but no more than you already had.

I did transcribe their marriage record, however, in case you did not have that:
Marriage record for James McCoy Nevin and Nelly Ewer
DoM: 11/11/1882 (please note the date; it was not 1881 as you posted here)
Groom: James McCoy Nevin
Occupation: Farmer
Residence: Clinton Township
Birthplace: Ireland
Service: Presbyterian
Officiant: John Irvin of Cumberland
Witnesses: J.C. Collingwood, Emma Collingwood
Father of Groom: Robert Nevin
Mother of Groom: Martha Stewart
Father of Bride: Henry Ewer
Mother of Bride: Mary Ewer

James McCoy Nevin died in Cumberland on March 17, 1938. There's an outside chance that Nelly might be mentioned in his obit (if there was one)...but probably not if their first marriage ended in divorce.

I transcribed the info on James, Rebecca and their children. Do you want it? If so, please let me know.

Jeff Martin, Chetek