She is a good and decent soul, trying to show Vash that the water will not, in fact, immediately kill him or steal his soul or anything.

"You know, that's a way of putting it I never thought about before," he hums, considering, playing idly with the picture of all that mixed bag of everything creatures. "Things WERE pretty regular for a long time and now it's like someone slammed on the accelerator into serious weirdness. Like stuff I was not prepared for. "