From Yahoo! News:
Benson wrote more than 130 books, including the 1940s Penny Parker mystery series, but she is best known for the Nancy Drew books that inspired and captivated generations of girls.
She wrote 23 of the 30 original Nancy Drew stories using the pseudonym Carolyn Keene. Paid $125 per book, she never collected any royalties.
Benson died in 2002 at 96 and left her home and possessions to her only daughter, Peggy Wirt, who died in January.