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You could initiate a local university alumna, or sorority sister's mom, with the goal to bring her in as an adviser.

ETA: Your adviser serves as a model of consistency within your chapter. She mentors the officers, helping them to meet their deadlines, counseling chapter members through personal issues and helping the chapter set and meet goals. The adviser enforces rules set in the chapter bylaws. She is not there to be the chapter leader-- that is what the officers are for. But with members graduating every year, and turnover in the chapter, a good adviser who stays active for a long time can help ensure your chapter's legacy.