How does the "Little Mermaid" go to the bathroom?

It's on youtube so look it up (real mermaid). I don't think I can give a direct link, so go look it up. Her legs were fused from the waist down, meaning her legs are stuck together. She has no rectum, no genitaria, no uterus, or bladder (probably spelled a lot of that wrong). So how does she remove waste from her body? Obviously, she has to eat, but how can she remove the waste her body doesn't need if she cannot excrete or urinate? Best answer, well, you know what you get.