She isn't really paying attention to her surroundings, but she is paying attention enough that she notices Nepeta walk in. She notices enough when she crouches down. It's the pun that gets her. She had already glanced down once, but it's the Purrl that has her giving Nepeta a second glance. She raises an eyebrow. She puts her pen down and discreetly lowers her voice. "Do you not like Earl Grey?"

She needs a closer look to be sure.

It could be a coincidence, of course. This could be anyone with a liking for catpuns. It could be anyone at all. "Or perhaps it's the milk you don't like?"