Buy some really expensive bedding. The most expensive you can find. Whatever it is, make sure it costs a lot. Take her out of her tub and set her where she can watch you. Replace her bedding with new expensive aspen bedding. Take your time. Put some effort in. Spread it and fluff it and make it as perfect as you can. Let her see you're putting a lot of effort into making her tub's bedding as perfect as it can be.
Set snake in tub. Wait 5 mins.
Poop. Everywhere. Guaranteed.