Most horror movies are made by dipshit horror nerds who only watch horror movies made by other dipshit horror nerds, so non-blaring/zooming movies are only made very rarely.
Well, aside from the obvious "she was never thrown in by a hideously strong abomination in the eyes of god and man before," you can justify it as her being too frightened to swim, or possibly with his y'know, hideous strength, he accidentally broke her arm or leg.
I searched pretty hard for the Young Frankenstein little girl scene to put alongside this. I couldn't find it. I had a tantrum because the Internet is unfair and I threw half an unfinished Hot Pocket against the wall. Now my mom won't clean it up and I have a headache.
I already 5'd this above, but I wasted that comment, so I'll just add here that this is totally awesome because it manages to be beautiful and sad and creepy all at the same time. Good job.