She's definitely in love with Ko already, just like Akira.
Wakes up too early anticipating meeting him again; kills time playing video game, vows never to play it again, only to immediately think about playing it with him in the future; can't stand smelling like a stray cat before they meet so she takes a bath; immediately leaps out of it when he sets off the 2-way radio watch; hasn't bitten anyone else since they met; actually doesn't want to see an old and reliable previous client, etc.
She's using her teasing to cover it up.