Take some Saran wrap or other clear plastic wrap and gently (not too tight; you don't want to cut off her circulation) wrap it from her ankles up, around and around. (I'd wrap her up to five inches above her ankles) Place her on the bed and handcuff her hands to the headboard. Put your weight on her Saran-wrapped ankles and proceed to tickle her mercilessly. Well, show a little mercy... Just a little. (I know you said no mummification scenario but I don't see how else to do it. Anyone else have an idea?) Maybe have her crawl headfirst into a sleeping bag, then zip it up... there are her feet! Just make sure she can breathe well.