In Of Mice and Men, Curley's Wife is a victim of sexism and the illusions of the American Dream. She has no name or place in this male-dominated workplace; therefore, she is a stock character: a flat, static, temptress by default.
Curley's Wife has desires, but only failed ones. She seems outgoing, but only because the men refuse to talk to her. She seems delusional, but only because she is so optimistic about her dreams. In short, she is a foil for Lennie and George, who also are filled with unrealistic illusions of the American dream. But, because they are men and therefore closer to realizing the dream, do we call them delusional when they too fail to achieve it?
Observe what she says:
If I catch any one man, and he's alone, I get along fine with him. But just let two of the guys get together an' you won't talk. Jus' nothing but mad. You're all scared of each other, that's what. Ever' one of you's scared the rest is goin' to get something on you. (85)
Here, I think she's speaking for the author. I don't see her as delusional or full of false desires. She's realistic.
In Chapter 3, Curley's Wife again calls out the men:
They left all the weak ones here. . . . Think I don't know where they all went? Even Curley. I know where they all went. (77)
Here, she comments on the Social Darwinism in the male society. She is informed of the double standards of men: her husband is at the cathouse. She knows her role as a play-thing on the ranch, and she lashes out at the weak men who are just like her.
Later, she says:
Listen...All the buys got a horseshoe tenement goin' on....None of them guys is goin'to leave that tenement. Why can't I talk to you? I never get to talk to nobody. I get awful lonely....What's the matter with me? Ani't I got a right to talk to nobody?...You're a nice guy....I ain't doin' no harm to you.
Here, Curley's wife is again being honest and realistic. She is lonely and questions why the men ignore her. She lacks a female community.
For these reasons, I would say that Curley's wife is not delusional, or outgoing, or desirous of love. Instead, she is a victim of sexism, male reputation, and double standards--and she knows it. She only wants the men to acknowledge it, but they can't. Steinbeck, then, wants his readers to acknowledge it.