For when "didn't" or "doesn't" could both work, in theory, but neitherfeels quite right.
Son: "Hey, we're on our way to the concert."
Dad: "Is your mother going?"
Son: "No, I figured she probably dodn't want to go.
"Didn't" would work here because they're on their way to the concert, but "doesn't" would work because they're not there yet, so "dodn't" is ideal here.