Given her age, it's likely that this is a second marriage for her, as well as for Richard.

1a.  Jordan R. Dodd, ed.  1993.  Kentucky Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

Bradley, Richard D.	Baker, Colena	10 Jun 1819	Warren Co.
Bradley, Richard H.	Pettus, Barbary O.	9 Feb 1832	Todd Co.
Bradley, Richard D.	Bradley, Nancy	17 Mar 1845	Christian Co.

I cannot find a marriage for Richard in the 1820s, when we would have expected him to marry and when he would have had to have married to be the Richard D. BRADLEY in the 1830 census of Logan Co.  The Richard D. BRADLEY who married Colena BAKER (and is in the 1840/50 censuses of Johnson Co., MO) is Richard Dickey BRADLEY, the son of Richard Tompkins BRADLEY and Abadiah DICKEY (i.e., he is not our subject).

1b.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

RICHARD BRADLEY Spouse: MANERVIA MYRS Marriage: 26 Dec 1854, Christian, Kentucky Source: Birth, Marriages, Deaths. Christian County (Kentucky). Clerk of the County Court

.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):

1830	Bradley, Richard D.	KY	Logan Co.	Russellville	p. 52
1830	Bradley, Richard T.	KY	Logan Co.	Russellville	p. 68
1830	Bradley, Thompkins	KY	Logan Co.	Russellville	p. 68
1830	Bradly, Richard	KY	Pulaski Co.		p. 31

These are the only Richard BRADLEYs indexed in Kentucky.  I don't believe any of them is our subject.  The Richard T. BRADLEY in Loganville is in his 60s and is listed two lines from his presumed son, Thompkins BRADLEY, who is in his 20s (m. Mary FUQUA on 5 Mar 1827 in Logan Co.).

.  1830 Census Index and Digital Images (online at Ancestry.com; Image #29 of 98; extracted by Diana Gale Matthiesen):

1830

KY

Logan Co.

Russellville

p. 52

Richard D. Bradley

210 001 - 110 010

200 000 - 211 000

These data indicate:

No., Race, Gender	Age Class	Therefore Born	Individuals Inferred
2 white males	4 or under	1825-1830	=
1 white male	5-9	1820-1825	=
1 white male	30-39	1790-1800	= Richard (b. 1802)
1 white female	4 or under	1825-1830	=
1 white female	5-9	1820-1825	=
1 white female	20-29	1800-1810	= Wife-1
2 male slaves	9 or under	1820-1830	= ? ?
2 female slaves	9 or under	1820-1830	= ? ?
1 female slave	10-23	1806-1820	= ?
1 female slave	24-35	1794-11806	= ?

This may or may not be our subject; or perhaps his age is wrong in the 1850 Census — women weren't the only ones to lie about their age when seeking a second spouse.

.  1840

.  1850 Census Index/Images (online at Ancestry.com; Image #4 of 18):  District No. 2, Christian Co., KY, p. 420B, 886/937, enumerated 16 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Richard D. Bradley	47	M	Farmer	3375	Kentucky
Nancy        "	47	F			"
Louisa R     "	17	F			"
Catharine R  "	16	F			"
Joseph P Hopson	22	M	Carpenter		"

Are Louisa and Catharine the children of Richard by a former marriage or of Nancy by a former marriage?

.  1860 Census Images (online at Ancestry.com; Image #70 of 295):  Hopkinsville P.O., Christian Co., KY, p. 572, 515/515, enumerated 21 Aug 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

R D Bradley	57	M		Farmer	4,000	15,000	Ky
M W Bradley	38	F					Ky
V Myers	13	F					Ky
Dick McDaniel Myers	14	M					Ky
Rachel Willson	40	F					Ky
A Willson	13	M					Ky

I would have pegged the MYERS children as Minerva's and MYERS as her married name, but other records show her as the daughter of David MYERS.  Or was she a MYERS who married a MYERS?