His mother doesn’t call him Butterball. Are you sure you’re his mother?
I can relax. I have about 2 hours before my next appointment is here. I can eat my chicken an watch the new episode of Supernatural.
The therapist is asking Butterball why he's late because he is always fifteen minutes late to every session. The therapist is very shocked that the patient responded to her like that, when she only simply asked.
The therapist is behaving this way because she knows that the person she's on the phone with is not Butterball's mother. She has the idea that Butterball might've had his friends plan to get him out of therapy. The therapist is confident about the person she's on the phone with.
The therapist is behaving this way because she can finally relax and calm down after the session with Butterball. She's catching up on her favorite show while getting ready for her next session with a patient.