Wysteria speaks of her 'dear friend' in past tense, and Margaery's too polite to press further, although she gets the feeling that if she were to ask, she'd get an easy waterfall of an answer. Instead, she nods politely to show that she's listening, and takes a moment (and a breath) to formulate the first of many questions she has.

"Have you been able to figure out any discernible pattern as of yet?" is what she asks first, deciding it's the safer option than asking questions that will lend uncomfortably accurate insights into the circumstances of her own arrival.