How did Elisa become mute?
What caused the scratches on her neck?
BTW, I loved the obvious use they were put to at the end.
Eliza actually had a very murky background. She was found near a river as a child and ended up in an orphanage. She has no memory of her past, but there were a lot of hints towards it. She was mute from the start. Eliza also liked water a lot, and wouldn't take showers. She always took baths to stay clean.
[spoiler]It's hinted that she is some kind of "mermaid" of sorts, but you only really get it when the creature puts his hands on her neck, and the "scratches" open up and are revealed to be gills. So all this time, she had been running around with improperly formed aquatic gills. It might also explain partially why she was attracted to the creature in the first place: she was also from a water-breathing, human-like species.[/spoiler]