The United States used to have a mortality schedule from 1850 - 1880 for those that died in the year prior to the regular census. Olive (Jacobs) Emery, wife of Henry Emery passed away September 26, 1859 of consumption which we know today as tuberculosis. Olive died in Weller township, Henry county, Illinois.
Olive's entry is number 20. The schedule indicates she was born in New York which matches the 1850 US Census. Most family trees I have encountered indicate Olive was born in Pennsylvania, possibly Philadelphia yet no one has been able to confirm her location of birth or the names of her parents.
If anyone has cracked the case on Olive's ancestry, please leave a message in the comments.