There is an ELIZABET DESPER listed on Menard Co IL death index; died 05-05-1947.
Also, you might want to contact Marvin Dellinger, email: email@example.com. He posted a family grouping on familysearch.org of JESSEE COX & FLORA J DESPAR. Posting states FLORA born April 1841 in Tennessee, died 27 Aug 1912 Ridgway, Gallatin IL, buried Jackson Cemetery, NE of Ridgway. You should be able to obtain her death record and perhaps that will show parents.