In the fourth and final interview session, conducted on December 13, 1991, Thornton continues to discuss living in Salem, including her involvement in early childhood education. She also continues to discuss Robert Y. Thornton’s career as state attorney general. She talks about her involvement in the Arts in Oregon Council and other arts organizations; describes her cornea transplant surgery; and discusses taking art classes. She talks about a trip she took to Japan in the late 1950s, about attending attorneys general conventions, and about the establishment of the Grove of the States in 1967. She closes the interview by discussing her involvement with the Portland Art Museum and other arts organizations.