Lorraine Fox (May 22, 1922-1976) was an artist whose work included illustrating magazines, book covers, and advertisements. She was inducted into the Society of Illustrators’ Hall of Fame in 1979.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Lorraine_Fox
Red Girl Illustration by Lorraine Fox
c.1966 / Mixed Media on Board / 28″x18″ / Private collection
Lorraine Fox on Artnet: http://www.artnet.com/artists/lorraine-fox/
Further reading:
https://www.illustrationhistory.org/artists/lorraine-fox
https://societyillustrators.org/award-winners/lorraine-fox/
https://www.brwnpaperbag.com/2017/03/16/tbt-lorraine-fox/
The Misty Miss Christy 
I think she did some Trixie Belden covers.
Certainly looks like it could be the case!
Reblogged this on sketchuniverse and commented:
🎈 SO TRUE DARLINGS, SOMETIMES I LOVE RED COLOUR FOR SOME DRESSES.