I just noticed what the vegetables floating in the water are -- cucumbers, eggplants, and tomatoes. Based on those, their tethered basket, and the posters, I have one conclusion:
She's fishing for kappa.
(Yes, she _could_ just be keeping the veggies cool, like with the watermelon in the lower left corner -- but notice what looks like an apple, on a string, floating downstream just below and to the right of the potted tree. I think the kappa is fishing for her.)