Well, that's off-the-charts stress for everyone ... I'm so sorry.
I agree that there is nothing she can do until the 10-day hold is up. And all the points Amanda made are excellent. I would probably want to set up an appointment with a vet behaviorist, when your cousin comes back, as I would want to know if Pepsi's bite was from fear, pain, or something else. I'm fairly certain this is not the first bite incident at the kennel, and they know how to proceed, it sounds like from the e-mail.
Sorry for all involved.