Quote 4
She turned on him in scorn. "Listen, N*****," she said. "You know what I can do to you if you open your trap?"
Crooks stared hopelessly at her, and then he sat down on his bunk and drew into himself. (4.116-117)
The only thing worse than being a woman on the ranch is being a black man. But Curley's wife doesn't feel any solidarity with Crooks: she just sees him as the one guy she can pick on instead of try to pick up.
Quote 5
"They left all the weak ones here," she said finally. (4.92)
Pot, meet kettle: Curley's wife is calling Crooks, Lennie, and Candy weak because they didn't go off to the whorehouse with the rest of the men… but here she is, too. She's weak just by default—and all the ostrich-feather heels and pretty dresses she can wear doesn't make her powerful.