Final answer:
Rusty is expressing frustration at Willard's behavior by asserting that she knows who she came with, which hints at annoyance and a desire to correct a possible misconception or to halt further questioning.
Step-by-step explanation:
Rusty’s exclamation, “Willard! Hey, Willard! I know who I came with, ok?”, expresses a sense of frustration at Willard's behavior. It does not indicate confusion about whom she came with, nor is it simply a reminder of their companionship or surprise at seeing Willard. The context in which she says this suggests that she is annoyed and possibly responding to an implication or action by Willard that prompted her to assert that she is aware of her own situation. Rusty's tone and the emphasis on “ok?” often connote irritation and the desire to correct a misconception or to stop unnecessary prompting or questioning.