She shoots back: "I didn't say that you were my brother, either, in case you were listening." And doesn't follow him.

She prefers working alone over group work anyway, you get more done. Especially if you partner is weird brat with issues.

"...And perhaps you should take baths more often than once a year, then!" This one is already said with a raised voice because he's some distance away already, and then she stomps off into the opposite direction.