LOL watch it poop while she's trying to put it in the warm water - hehe 
Maybe... if it only likes to poop on your hand - act like you're going to pick her up and have her stand sideways against your arm so it could poop on the cage floor. I guess that's if she poops immediately, if not, then.... I guess I agree with Rob
Everyone else's beardie but mine likes pooping in water, but then again - my beardie is a weird one.
OH MAN! he didn't poop for 3 days straight, so his eating went down - and then BAM! After he finished totally shedding yesterday, he had the biggest poop I've ever seen and the biggest peice of urate along with it. It was HUGE! I'm gonna take a picture of it before I clean it up today 
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0.0.1 Bearded Dragon (Cookie Monster)
1.0.0 Crested Gecko (Vas-D)
0.0.2 Fire Bellied Toads (Norman & Forman)
0.0.2 Goldfish (Lenny & Carl)
1.0.0 Black Lab / Pit Bull (Mikey)