Individual Details

Married Jacob Gibson. I cannot find them in the 1850 census in KY to confirm her birth year.
Other databases give her birth year as 1822. This is wrong. I found her marriage listed on the Clay Co USGenWeb page:
Jacob Gibson married Nancy Bowman - Date of bond: 17 Jan 1824 Date of marriage 19 Jan 1824.

I failed to find a Jacob Gibson in KY censuses beginning as early as 1830.

Some databases also list an Ann Bowman, b. 1805 who married an unknown Roberts. I suspect perhaps Jacob Gibson died at an early age and Ann/Nancy remarried. That would explain why no Jacob Gibson can be found.
There is also a Clay Co marriage for Ann Bowman to James Roberts, 3 Oct 1825. IF this is the same person as Nancy, she should have been marrying as Nancy Gibson.... Was this Nancy's sister Hannah instead?

A James Roberts was living in Clay Co KY in 1830 and on the same page with many of the Bowmans. He was obviously in a blended household, but appears to have been the oldest male.
James Roberts: 1m 5-10, 1m 15-20, 1m 20-30.
2f under age 5, 2f 5-10, 2f 10-15, 1f 15-20, 2f 30-40, 1f age 50-60.

I suspect there may even have been two separate sisters - Ann and Nancy

Father	ELIJAH BOWMAN (1773 - 1840)
Mother	ELIZABETH GENTRY (1778 - )
Sibling	Nicholas BOWMAN (1797 - 1861)
Sibling	SARAH "SALLY" BOWMAN (1798 - 1886)
Sibling	Mahala BOWMAN (1801 - )
Sibling	Elijah BOWMAN Jr. ( - )
Sibling	Hannah BOWMAN (1807 - )
Sibling	Joseph BOWMAN (1808 - 1863)
Sibling	Deborah BOWMAN (1810 - 1884)
Sibling	Elisha Williamson BOWMAN (1815 - 1910)
Sibling	Henry B. Bowman (1820 - 1900)
Sibling	Isabell "Ibby" BOWMAN (1820 - 1885)