Another poster gives the vital statistics and source for someone who seems to be "your" Emma:
Emma Pruitt born about June 1869 in Jasper, Iowa. She married William Thomas Points 28 Aug 1896 in Council Bluffs, Pottawattamie County, Iowa. Emma's parents: Mark Pruitt and Eliza Baker (no further information) Information found in marriage record for William Thomas Points and Emma Pruitt in Council Bluffs.
Thus we can see the Emma who married John Stoffel may likely be a different person. Since he is born in 1890, "your" Emma in 1869, they are not a match made in heaven.
1940 Dakota, Dakota, Nebraska John Stoffels 50 born about 1890 in Iowa, farmer Emma Stoffels 67 born about 1873 in Iowa Residence in 1930: Same place for both
1930 Dakota, Nebraska John Stoffels b about 1890 Emma Stoffels b about 1887