Wondering if you are still available since this post is from so many years ago. I'm researching a Uzial Empson in Monroe county, IN who had a daughter Rebecca born about 1843 by his second wife Hannah Dearman. I'm wondering if this is your GGGGrandmother, Rebecca. I don't have a husband's name for her.
Hannah died in 1848 so Uzial is in the 1850 census with his children, no wife. He married Hannah's sister? Mary Dearman after that, but is still listed in 1860 without a wife, so she must have died, too.