Mary Ann may have been fibbing about her age later in life, so the birthyear on her tombstone may be wrong; otherwise, she married at the age of 12.  Secondary sources say John & Rachel are her parents, not her husband's parents.

— born in Muscogee Co., GA:
6.  Sophia McBRIDE, b. 1841/2

1.  D.L. Murray & N.R. Murray.  1995.  Marriage Index: AL, GA, SC, 1641-1944.  Salt Lake City, UT (Broderbund CD-3):

Mcbride, John

Mcbride, Mary Ann

Sep 8, 1825

Crawford Co.

2.  1830 Census Index/Images (online at Ancestry.com; Image #3 of 46; extracted by Diana Gale Matthiesen):

1830

GA

Crawford Co.

Roll M19_16

p. 394

Ln. 12

John McBride Jr

000 010 - 000 100

200000-110000

These data indicate:

No., Race, Gender	Age Class	Therefore Born	Individuals Inferred
1 white male	20-29	1800-1810	= John (b. ca. 1802)
1 white female	15-19	1810-1815	= Mary Ann (b. 1813)
2 male slaves	9 or under	1820-1830	= ? ?
1 female slave	9 or under	1820-1830	= ?
1 female slave	10-23	1806-1820	= ?

There was no John McBRIDE, Sr., indexed in Crawford County or anywhere else in Georgia.

3.  1840 Census Index/Images (online at Ancestry.com, Image #3-4 of 6; extracted by Diana Gale Matthiesen):

1840

GA

Muscogee Co.

Dist 921

Roll M704_47

pp. 328B-329A

Ln. 2

John McBride

000 001 - 230 010 100

200000-311000

0400000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 white male	30-39	1800-1810	= John (b. ca. 1802)
2 white females	4 or under	1835-1840	= Mary (b. 1839/40) = Sarah (b. 1837/8)
3 white females	5-9	1830-1835	= Eliza (b. 1834) = Rachel (b. 1830/1) = Catherine (b. 1829/30?)
1 white female	20-29	1810-1820	= Mary Ann (b. 1813)
1 white female	40-49	1790-1800	= mother?
2 male slaves	9 or under	1830-1840	= ? ?
3 female slaves	9 or under	1830-1840	= ? ? ?
1 female slave	10-23	1816-1830	= ?
1 female slave	24-35	1804-1816	= ?
4	persons employed in agriculture

Listed two lines from possible brother, James P. McBRIDE (æ 20-30).

4.  1850 Census Every-Name-Index/Images (online at Ancestry.com; Image #231 of 306 — indexed "Mary Ann M. Bryde"):  Division No. 23, Barbour Co., AL, Roll M432_1, p. 223A, 1735/1782, enumerated 15 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Mary Ann McBryde	37	F			1000	Geo
Catherine	21	F				"
Rachel	19	F				"
Eliza	15	F				"
Sarah	12	F				"
Agnes	10	F				"
Sophia	8	F				"

Surely our widow is fibbing about her age because, otherwise, she married at the age of 12.  But why has Catherine added a year to her age?  In the 1830 and 1840 censuses, our subjects have no child born before 1830.  Listed next to John & Rachel McBRIDE, whom secondary sources say are her parents (not her husband's parents).