I bet she’d be more ticklish if she was blindfolded and put into a room with a stranger working over the soles of her feet. I would tie her up, laying down on her back with her soles up in the air tied to the legs of a chair. Then I would vigorously tickle up and down the bottoms of her feet, particularly working over the sensitive spot below her toes. I bet she would be hysterical! How does she handle having her toes sucked?