She's utterly confused. Really. "I have no idea who you are. Should I know? Are you on Broadway or something?" Yes the idea of legal matters can go hand in hand in the theater, right?
Tiffany isn't exactly the most observant of people and takes no notice of any possible inner battle of others. So she simply points to the area that leads to the restrooms. "The restrooms are right over there. Take your time! I'll have the rest of your order here by the time you get back."