At this point, it's not long before the officer election process begins. If you can get elected to an office - maybe not an executive board-level job, but
any job - you can truly begin to change things.
You can also begin asking some questions about why the chapter is not complying with the sorority's constitution, bylaws or policies. And don't take "we've always done it this way" as an answer.
Be nice, be positive, be encouraging, and smile!
But keep asking those questions.