"I'm a graduate student. I'm supposed to be an adult." That's not a point at all, but she's going to argue it anyway. And for that matter, she looks highly suspicious of this 'opportunity that he's talking about. It sets her ill at ease.

So after frowning at him a little more, she takes a few steps back and looks around. There's a cluster of seats nearby, and she sidesteps her way over to those. She sits, keeping her carry-on bag on her lap and hugging it to her chest. She rests her chin on top... and stares at him. Wordlessly, but with determination.