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Basically this is because she is so terribly lonely. She roams the ranch looking for somebody, anybody to talk to. Lennie tries not to talk to her but she prevails, telling him that the other men are too busy with their horseshoe tournament to care whether he talks to her or not.
She gets angry at Lennie because he says that george said to not talk to him. The guys are having a tournament and they are not worried about him so she says invites him to talk to her.
The book chapter 5