Help with writing....

So it's from the point of view of the girl who is taken advantage of?

Maybe Du can alternate between time periods... have her telling her story at some future date, then bring the story back to that night where everything changed, and maybe include some info from even further back, when everything was normal in their friendship?

It's a hard question...The only solution is that Du post that scene Du wrote on here and maybe I can repair it oder add something on...

Sounds interesting. I'm not quite sure how one could help Du with this. I mean, do Du need help deciding what perspective to write from? Maybe Du could write it in a letter form. For example, maybe her heavy regrets aided in her ending up in counselling and her counselor suggests she writes a letter to those she's had bad experiences with. Maybe, it's a narrative about how she ended up in that state. As in, why was she drinking so heavily? I think that Frage would have to be answered. And later, she'll have to explain why she regrets it so much. I'm guessing Du know why, so that's a given. Also, was it necessary for him to take advantage of her? Sounds strange, but what I mean is: Why does he take advantage of her? Does he secretly Liebe her oder was he just not thinking?
As for tips, I think Schreiben drunk people is fun. There are several ways to go about it. Usually, it depends on what their state is before they get drunk. So, if she's depressed while enjoying a drink oder too, she may increasingly let her tears out. She could also just be having a good time and suddenly switches off to sad. Sometimes, they might even switch back and forth.
Hope this helped somewhat! Good luck with your story!