One method, if youvegot the time and space, would to build a large x frame, as long as its longer than your pets arms and legs theres no way she will be able to move it enough to escape, expecialy if you duct tape or leather strap her wrists, elbow, ankle, thigh, and waist. the bonus is that she and her pleasures will be accesable. The only down side is that the x frame would be rather large, unless you put two washers (maybe some ballbearings) between a large screw attaching the two peices of wood together then it would be collapsable. Im sure anyone creative enough to partisipate in bondage games could come up with a cover story for it, ie, "its an experimental washing line", or "havent you heard, everyone's got one, there the latest craze, decrative light switch framing, duh.

Not the most practical approach but woth a thought, im off to make one now, i'll be back in a couple of hours.