Amazing pics! Thanks so much!
You asked for a "new method". One comes to mind.. How about ice over her bare soles? I don't recall if you read my posts before, but,. one time in college, I tickled a female friend's bare soles with ice, when she was sleeping, after previously having tickled her soles with my fingers when she was awake. Her toes were going absolutely crazy in her sleep. She woke up, and was a bit pissed, but I managed to get a couple of more tickles in with the ice cube, before she demanded I stop.
Just a thought.