When life gives you mad science lemons, make mad science lemonade.
(Click on the image for larger size. 
Cassandra’s Self-Sacrifice, Page Seven written and commissioned by Dr. Faustus of EroticMadScience.com and drawn by Lon Ryden is published under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.)
What happened to her? It ate her? Or turned her to water?
Ate, though perhaps this will become clearer only in time.
It ate her.
I don’t really know why, but this story line is oddly disturbing to me. Perhaps it is because of being human, I think of us as belonging at the top of the food chain. But here is a creature that lacks any type of sophisticated nervous system, let alone any intelligence, that has evolved a method of luring much more “intelligent” creatures to their death.
In her letter, she stated that she “wasn’t suicidal”, but I’m sure that she knew what would happen when she entered the water. The electrical emissions from “Shoggy” causing sexual arousal overrode her self-preservation instincts.
There’s a backstory here which will make Cassandra’s motivations clearer (and more complex). Have patience; it will emerge.
Though pondering it a little further it might be the case that with the backstory included Cassandra’s actions might become even more disturbing, although that would be dependent to a large extent on the worldview of the reader.