How does Steinbeck describe Curley's wife's struggle?

From the text:

She struggled violently under his hands. Her feet battered on the hay and she writhed to be free; and from under Lennie’s hand came a muffled screaming.

And she continued to struggle, and her eyes were wild with terror. He shook her then, and he was angry with her. “Don’t you go yellin’,” he said, and he shook her; and her body flopped like a fish. And then she was still, for Lennie had broken her neck.