According to more than one source, she lives in Riverwoods, Illinois.
She wrote at least five horse novels in the 1970s and 1980s, plus 15 non-fiction books - including biographies.
Not to be confused with the much younger writer of coloring books - I think.
"Contributor of more than fifty articles and stories to periodicals, including American Girl, Outdoor World, Midwest, Modern Maturity, Discovery, Modern Veterinary Practice, and Teen Time. Contributing editor of American Horseman, 1977."
"Carl Sandburg Award for best children's book of 1981-82, Chicago Public Library Friends, for Behind the Scenes at the Horse Hospital; recommended book for the 'reluctant young adult reader.' "
https://www.google.com/search?biw=1266&bih=777&tbm=isch&sa=1&ei=0OEfXPyPH8TM_Aato4mICg&q=%22fern+g+brown%22+&oq=%22fern+g+brown%22+&gs_l=img.3...4211.4211..4527...0.0..0.59.59.1......1....1..gws-wiz-img.Cpy8qEHM_L4
(book covers)
http://www.illinoisauthors.org/cgi-bin/illinoisAuthors/getSpecificAuthor.pl?uid=7921
(8 synopses)
http://worldcat.org/identities/lccn-n84229636/
(more synopses)
https://www.goodreads.com/author/show/98252.Fern_G_Brown
(reader reviews)
WRITINGS BY THE AUTHOR:
JUVENILES
(With Andree V. Grabe) When Grandpa Wore Knickers (nonfiction), Albert Whitman, 1966.
Hard Luck Horse (fiction), Albert Whitman, 1975.
Racing against the Odds: Jockey Robyn Smith (biography), Raintree, 1976.
Scooby Doo and the Headless Horseman (picture book), Rand McNally, 1976.
Scooby Doo and the Counterfeit Money (picture book), Rand McNally, 1976.
Scooby Doo and the Santa Claus Mystery (picture book), Rand McNally, 1977.
Clue Club and the Case of the Missing Race Horse (picture book), Rand McNally, 1977.
Dynomutt and the Pie in the Sky Caper (picture book), Rand McNally, 1977.
Bugs Bunny, Pioneer (picture book), Western Publishing, 1977.
You're Somebody Special on a Horse (fiction), Albert Whitman, 1977.
Jockey, or Else! (fiction), Albert Whitman, 1978.
The Great Money Machine (nonfiction), Messner, 1981.
Behind the Scenes at the Horse Hospital (nonfiction), Albert Whitman, 1981.
Valentine's Day (nonfiction), F. Watts, 1983.
Etiquette (nonfiction), F. Watts, 1985.
Amelia Earhart Takes Off (biography), Albert Whitman, 1985.
Horses and Foals (nonfiction), F. Watts, 1985.
Our Love (fiction), Fawcett, 1986.
Hereditary Diseases (nonfiction), F. Watts, 1987.
Rodeo Love (fiction), Fawcett, 1988.
Baby Sitter on Horseback (fiction), Fawcett, 1988.
Teen Guide to Childbirth (nonfiction), F. Watts, 1989.
Franklin Pierce, 14th President (biography), Garrett Educational Publishing, 1989.
Teen Guide to Caring for Your Unborn Baby (nonfiction), F. Watts, 1989.
James Garfield, 20th President (biography), Garrett Educational Publishing, 1990.
Owls (nonfiction), F. Watts, 1991.
Special Olympics (nonfiction), F. Watts, 1992.
Daisy and the Girl Scouts: The Story of Juliette Gordon Low, Albert Whitman, 1993.
American Indian Science: A New Look at Old Cultures, Twenty-First Century Books (New York), 1997.
Lenona.