The reference to Jackson's invented language harkens back to her college days at the University of Rochester:
Rather than following her syllabi, Jackson pursued
her own intellectual interests: at one point she spent hours
devising an invented language called Lildsune, complete
with grammatical rules, and even wrote poetry in it.
(Franklin p. 58)*
No wonder she liked Tolkien!
But the story about Jackson I liked best was The Dime of Wind:
When eight-year-old Laurence asked his mother how
he ought to spend a dime, she suggested that he give it
to the birch tree in front of their house. He promptly went
outside and asked the tree for a dime's worth of wind.
To Shirley's amusement, a massive hurricane struck that night.
"All we could figure was that wind must be very cheap indeed
for him to get that much for a dime" she wrote.
--current reading: the Franklin.
*apparently Jackson's Lildsune material is now in the Library of Congress