This is one of her FSA photos. Her field notes record that it shows "mountain people carrying a homemade coffin up the creek bed to the family graveyard where it will be buried. This section is too isolated to have a formal funeral service immediately."
Here, with her captions, are some photos that Wolcott took of a memorial service such as the one she mentions in field notes for the previous shot.
And finally, here is another photo from her visit to Breathitt, Kentucky.
This photo shows Wolcott in 1940.
This one, taken in 1940, is on the wikipedia page for her.
This one by another of the FSA photographers shows her on a farm in Montgomery County, Maryland.
This one was taken in New York in 1934 by Trude Fleischmann.
Some sources — web sites:
Color photos in LC collection via Flickr
Marion Post Wolcott, New Deal Narratives, FSA photography, Juliet Gorman, May 2001, Oberlin College
Marion Post Wolcott
Marion Post Wolcott on Shorpy.com, which is "a vintage photo blog featuring thousands of high-definition images from the 1850s to 1950s. The site is named after Shorpy Higginbotham, a teenage coal miner who lived 100 years ago."
Oral history interview with Marion Post Wolcott conducted by Richard Doud at her home in Mill Valley, California, January 18, 1965.
The Photography of Marion Post Wolcott from the University of Virginia, edited by Linda Wolcott-Moore
Marion Post Wolcott Photography for the Farm Security Administration from the University of Virginia
Marion Post Wolcott - FSA photos Part 1 from the University of Virginia
Marion Post Wolcott - FSA photos Part 2 from the University of Virginia
Marion Post Wolcott - FSA photos Part 3 from the University of Virginia
Marion Post Wolcott Post FSA Photography from the University of Virginia
Marion Post Wolcott A biographical sketch by Linda Wolcott-Moore
This link takes you to photos of her and images of her photographs on Google: Marion Post Wolcott on Google Images.
Some sources — books:
Looking for the light: the hidden life and art of Marion Post Wolcott by Paul Hendrickson (New York: Knopf, 1992)
Marion Post Wolcott: a photographic journey by Jack Hurley (Albuquerque: University of New Mexico Press, 1989)
Marion Post Wolcott, FSA Photographs (Carmel, CA: Friends of Photography, 1983)
The photographs of Marion Post Wolcott (Washington, DC: Library of Congress in association with GILES, 2008)
Marion Post Wolcott: Farm Security Administration photographer in eastern Kentucky by Margaret Anna MacKichan (University of New Mexico, 1977)
Let us now praise famous women: women photographers for the U.S. government, 1935 to 1944: Esther Bubley, Marjory Collins, Pauline Ehrlich, Dorothea Lange, Martha McMillan Roberts, Marion Post Wolcott, Ann Rosener, Louise Rosskam by Andrea Fisher (National Museum of Photography, Film, and Television, Great Britain, Pandora Press, 1987)
The farm security administration photographs of Marion Post Wolcott: a cultural history by Julie M. Boddy (State University of New York at Buffalo, 1982)
 To see my FSA and FAP posts, click the FSA and FAP labels on the right-hand panel of this blog
 Curators in the Library of Congress Prints and Photographs Division have put together a useful web page on Women Photojournalists of twentieth century America.