I don't like to limit water. They are just so small and maybe I'm just too paranoid, but I wouldn't want to throw their body's balance out of whack. Maybe you could just take a few steps back and stick with only the crate for a while. Then when she gets that down pat, bump her up to the x pen. Can I ask how much space she has in the crate? Tic used to poop in the crate and the trainer I spoke with said that he had too much space (even though I though it was a small space).