It's not paranoia if they're actually doing what you're worried about, is it? Or not simply paranoia. Cassandra has been suspicious since she's arrived. It's not going to change any time soon. (Except for the worst.)

She's studying things thoughtfully as she wanders around the room. "Everything seems a bit more... technologically focused, at least in the cities we've been in, so I don't think they'd lean towards more magical means of surveillance? Doesn't mean they can't. Doesn't mean they don't. Just that magic doesn't seem to be their first resort. Which means we might be able to devise methods to give ourselves a bit more privacy."