I have Cynthia as marrying Homer Abell in 1872. They show up in the 1885 Colorado Census, 1900 and 1910 in Missouri and then 1920 and 1930 in Idaho. I have the census records written up. If you need the info e-mail me at firstname.lastname@example.org
Also I have not been able to find her in the 1870 or 1880 census. He you had any luck there.