EUREKA!!!!

That's what Lila wanted to say when she screamed at the captain 'I'm wathever the fuck you want me to be'. She was saying that: whatever he sees of her, is whatever he will think of her, and after a while that's what she will become (how can you ever be something else then what someone else thinks of you, because you only exist when someone else thinks of you). The next step is the scary one; when the idea of what she 'is' becomes so inscribed inside the mind of the captain, he wont be able to see anything else then what he knows she is (because he thinks that he knows what she is, so in this case, thinking something and knowing something is the exact same), she will therefore stay 'whatever the fuck he wants him to be' for the rest of her life. And that's what kills the dynamic beauty.