Tombstone Inscription: "EBENEZER Z. OLNEY 1817-1891 - LAVINIA M. his wife 1823-1911," Greenwood Cemetery; Eureka, Greenwood, Kansas; created by: Judy Mayfield; Find A Grave memorial # 21452439; Find A Grave; www.findagrave.com.
There are two beautiful photos of the stone and the cemetery, posted by Judy in 2007.So Eureka is where it ended for Lavina.We still need to find records of her two marriages...and to determine if QUACKENBUSH (QUACKENBOSS?) was her maiden name.
I'm thinking along exactly the same lines with regard to numbers 2, 3, and 4 of your post. Again, great work!