Maudie Hopkins (December 7, 1914 -- August 17, 2008) was an American woman believed to be the last publicly known surviving widow of a Civil War veteran.

Answer this question: when did the last civil war veteran widow die? Let's give stream of consciousness first:
The relevant information is: Maudie Hopkins (December 7, 1914 -- August 17, 2008) was an American woman believed to be the last publicly known surviving widow of a Civil War veteran.
So, the final answer is Maudie Hopkins.