Ilde has always had the bad habit of watching people and trying to figure them out-- the first time she walked into the Vault, it had felt like being utterly spoiled, which she figures is precisely what they're going for and so she indulges and enjoys it. If you want to figure somebody out, after all, when better? Like Irene says.

The way she brightens as she realizes her own agreement is a little bit of the school girl done good, the way a certain kind of clever young thing glows under praise (and wilts under its lack); she's younger than she should be and it shows in ways she isn't conscious of. "I like that," she says, "I think that's true. I think you see a lot more of someone when they want something badly enough."