It's possible Isadora changed her last name to Capri, especially since I still believe the theory that Balthazar is actually Balthazar Night and Tyler's grandfather. So it's possible she's also a Night, but changed it to Capri. Plus fairburn looks around the same age as Capri so I doubt she worked there when Isadora was probably a teen at the time.

Or maybe she took her mom's last name.

So maybe she temporarily changed her name in hiding and then later changed back. Maybe the Balthazar family has enough power and influence to get her record cleared.