It wasn't entirely the truth but the discussion of her powers put her on the defensive.
"Not normally. It was an accidental discovery. When I was a child I used it so that the wealthy..." Selene stopped herself. Telling Zaladane she used to feed from the rich and powerful, when Zaladane herself was rich and powerful, seemed like a poor idea. She had to find a way to manage that sentence.
"...would take me in. Protect me. I was too young to know what to do otherwise."
Selene took another large drink. She decided to broach a possibly sensitive subject.
"I've told you that I mean you no harm. Without my powers I'm of no use to you or anyone else. All I would like to do is find a way home."