Daughter of Samuel and Anne (Kennedy) Reed, Margaret K. Reed was born circa 1794. After the early death of her mother, Margaret's sister, Maria, apparently assumed the care and upbringing of Margaret. Margaret married her cousin, James Brown, 13 January 1812; a careful view of the marriage image may indicate that the year was 1811. It's possible that her husband's given name was James Benjamin (Brown). The death entry for their son, James S. Brown, died 13 December 1886, Orange County, VA, lists his parents as Margaret Brown (nee Reed) and his father as Benj Brown.

Mrs. Brown nee Reed died 4 August 1849 at the home of her sister and brother-in-law, Mr. Samuel & Eliza (Reed) Cooper, in Martinsburg, her death notice from the Virginia Press shared 8 April 2023 by Contributor April (49217035) • [email protected]. With actual interment location unknown, it's probable that Margaret rests in this cemetery as do her sisters, Maria Cooper nee Reed and Eliza Baker nee Reed.
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Census entries below of the Brown family suggest that James Brown died sometime after 1840. In 1840, the Brown household of white persons, Martinsburg, Berkeley, VA, now WV, lists two males 20-29, and three females 5-9, 15-19, 20-29, in addition to the assumed couple, James and Margaret Brown.

a source for some of above: Kith And Kin; copyright 1922 by Mrs. John Russell Sampson.
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For a biography of Mrs. Brown's son, James Stephenson Brown (1814-1886), please see image from Hardesty history.

A death notice of Mrs. Brown's son is directly below:
Spirit of Jefferson., January 04, 1887, Image 4
About Spirit of Jefferson. (Charles Town, Va. [W. Va.]) 1844-1948:
Capt. James S. Brown, a native of Berkeley county died recently at his residence in Orange county. He commanded the "Wise Artillery," Confederate army, during the late war.
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Margaret's two sisters, Eliza and Maria, both died of cholera in October of 1854; see their death notices.

Another death notice for Maria Baker nee Reed, Margaret's sister, appeared in the Baltimore Sun, 26 October 1854; see image.
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Margaret K Reed in the West Virginia, Marriages Index, 1785-1971
West Virginia, Marriages Index, 1785-1971
Name: Margaret K Reed
Gender: Female
Spouse's Name: James Brown
Spouse Gender: Male
Marriage Date: 13 Jan 1812 [or 1811]
Marriage Place: Berkeley, West Virginia

1820 United States Federal Census about James Brown Name: James Brown
Home in 1820 (City, County, State): Middletown, Berkeley, Virginia
Enumeration Date: August 7, 1820
Free White Persons - Males - Under 10: 2
Free White Persons - Males - 26 thru 44: 1
Free White Persons - Females - Under 10: 1
Free White Persons - Females - 26 thru 44: 1

..1830 United States Federal Census about James Brown Name: James Brown
Home in 1830 (City, County, State): Berkeley, Virginia
Free White Persons - Males - 10 thru 14: 1
Free White Persons - Males - 40 thru 49: 1
Free White Persons - Females - Under 5: 1
Free White Persons - Females - 10 thru 14: 1
Free White Persons - Females - 30 thru 39: 1

James Brown in the 1840 United States Federal Census
Name: James Brown
Home in 1840 (City, County, State): Martinsbury, Berkeley, Virginia
Free White Persons - Males - 20 thru 29: 2
Free White Persons - Males - 50 thru 59: 1
Free White Persons - Females - 5 thru 9: 1
Free White Persons - Females - 15 thru 19: 1
Free White Persons - Females - 20 thru 29: 1
Free White Persons - Females - 50 thru 59: 1
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daughter's memorial: Annie Elizabeth (Brown) Dixon (1818-1899), Find a Grave Memorial 73241749

Reed, Kennedy family information and more: http://people.virginia.edu/~rtg2t/kin/data/Kith.and.Kin.txt
KITH AND KIN
FOR THE CHILDREN OF
MR. AND MRS. JOHN RUSSELL SAMPSON
BY THEIR MOTHER
RICHMOND, VA..
THE WILLIAM BYRD PRESS, INC.
1922

A Samuel Reed descendant reported December 2020 that Mrs. Brown's father, Samuel Reed, did practice law in WV for 20 years. A widower at the time of his death, he did not die in New Orleans. At the end of his life, he was quite ill and lived on a farm with friends in WV.∼Daughter of American Revolutionary Continental Army officer, Lt. Samuel Reed, who served after the American Revolution as an attorney in Berkeley Co., for over 20 years.