Overall Plot

As shown in the opening itself, the film begins with the scene of a party. The text saying "Don't worry tonight will be fine" refers to the party happening on the Friday night. The protagonist is revealed to be a heavily introverted character, struggling with the expectations of teenage life hence the purpose of the text to reassure her. 

At the party itself, the protagonist witnesses or overhears a suspicious argument between numerous people. Upon realising that the protagonist has overhead their conversation, two other characters violently threaten her, leading into the bathroom scene. 

It is revealed later in the film that she was threatened again at the party forcing her to leave, evidently distressed. Helin's character seen waiting outside the flats could then have received a text saying something along the lines of "if you see a girl running out of the party. She knows!". 

I think if we were to create a full film it would be based upon the idea of her almost being hunted down and forced into keeping quiet. In doing so, the plot would be in keeping with the teen drama/thriller genre as key aspects of youth would be explored alongside the more thrilling, psychological aspect of the plot.