I really need help with my cousin?

Your cousin mad a mistake. What you can do is learn from her mistakes and perfect yourself to fit how you want to be, like she was, and most likely still is. If she's ever tempted again, tell her how worried you got the first time, and judging from the way you describe her, she'll take that into account and not drink again. If you're still worried, talk to her. She might be able to solve your frustration. Until next time, HAND! (have a nice day)