Score

I would have liked to add this, set in the Tierra del Fuego, but unfortunately it's not on GR:

Darling of Sandy Point or
"Darling(s) of Sandy Point; A Story of adventure around the Straits of Magellan"
Bessie Marchant
"George & Willy have come to Sandy Point looking for their father, but he has disappeared and is thought to be dead. They are taken in by Elias Dawe who is already looking after Darling, a girl who was found alone on a raft after a shipwreck."
London : Christian Knowledge Society, [1907]
OCLC Number: 1063116187

and these others by the same author, also set in Chile:

Greta's Domain: A Tale of Chiloe
Bessie Marchant
"Greta and her younger brother and sister, along with their mother are sailing to England from South America when they are forcibly put off their ship because the captain thinks they might have smallpox. Greta helps them to have a comfortable life and solves several mysteries."
London, Glasgow, [1925]
OCLC: 335189233

Heroine of the Ranch - a Story of Tierra Del Fuego
Bessie Marchant
"A girl's mother wants her to go to school in the city so that she will not become interested in running the family horse ranch."
Blackie & Son: London, 1914.
OCLC Number: 562108429
364pp

Maisie's Discovery
Bessie Marchant
"In a remote part of Chile, Maisi is left alone when her Uncle Edwin dies, and she is taken in by the local English clergyman, John Graily and his sister Sue. Maisie learns secrets about her past, and John and Sue get caught up in a local revolution."
London & Glasgow, [1941]
OCLC: 562108748