"It must be true that surviving after being on the brink of death changes a person."
I mean you're not wrong, it's half true. That's what happened.. but that's also not what happened
"You have something you need to do for me." Instead of "I have something I need you to do for me." really goes to show her attitude and subtly enforces her position over May.
@zastanna I think the Castor Company is owned by the real Lucia's father.
Elena will offer him the cure for Lucia's disease in exchange for being allowed to use the girl's identity, and maybe some other stuff. He becomes one of her staunchest allies in the future.