I also am researching the Wells family in Magnolia, Rock Co, Wisconsin....There are two Wells family lines living there at the same time.
James Wells was married to Catherine Silvernail -daughter of Nicholas O and Elizabeth Cole Sivernail. I can't determine when she died. James and Catherine had a daughter Rachel Ann who married Joseph Wyram REED and died young in Rock County wisconsin
James Married #2 Emma Claracy REED, widow of Charles DILLREE who previously had lived in Lockport, Niagara, New York and moved to Macomb county, Michigan. at the death of charles in 1862, Claracy/Emma moved to Magnolia, Rock County, Wisconsin with her two youngest children: Lewis Judson DILLREE b. Dec 1852, married Kittie Emily HESS and d. 30 May 1933 in Magnolia, Rock County Wisconsin
Caroline DILLREE born Abt. 1855 probably Michigan
I don't know how much that helps, but if you find where James/Catherine Silvernail/Claracy Emma reed are buried or when the two wives died, I'd be thrilled to hear from you.