Now tagging the right comment...
[Maybe he'll notice miss probably-has-been-very-scarce-since-Anna's-arrival, currently having some trouble with the water. It's lapping up at her heels, as if trying to make her walk in the direction of the reservoir.
It's probably just playing, but Elsa looks very unsure about how to respond to this unwatery behaviour. She kind of ends up. taking a step forward as soon as the water splashes against her. So yay, the water's winning.]