Looking for Eunice Whitehead of Illinois

Eunice Whitehead married John Henry Woods. I am trying to find both their parents. I am trying to find information both Eunice and John. I have not found their graves. I have found John Henry Woods in Ohio. For along time, I couldn't find anything on Eunice. This year I found that Eunice was suppose to be born in Illinois. I did find John Woods and Eunice Whitehead on a daughter's marriage and another daughter's death records. I read somewhere she was in Illinois and died there. Can't find the records to prove it. I do know a Henry Woods died in Fulton Co., Illinois in 1866. I also know Henry married Mrs. Eliza Neff. After John Henry Woods' death, Eliza moved Iowa. As you can see, what happened to Eunice Whitehead? I am trying to find all the information I can on Eunice Whitehead and John Henry Woods.