Her motivation for marrying Curley is likely a combination of factors, including financial security and social status. Curley is the son of the ranch owner, so marrying him would give her a relatively comfortable life. Additionally, being married to Curley would give her a higher social standing in the community. However, it's important to note that Curley's wife is not happy in her marriage. She is often seen flirting with other men and complaining about Curley. It is clear that she does not love Curley and that she only married him for practical reasons.