There is a Samuel and Eunice Boone in the Lagro IOOF Cemetery in Indiana, with a picture of her tombstone.
Find A Grave, database and images (FindAGrave : accessed 14 March 2018), memorial page for Eunice Emily Pratt Boone (22 Feb 1825–9 Nov 1887), {{FindAGrave|31720310}}, citing Lagro IOOF Cemetery, Lagro, Wabash County, Indiana, USA ; Maintained by Marcus Thompson (contributor 47066546) .