This is the girl accused for starting the Instagram account: [link to www.nattstad.se]
In her latest blog posts she explains her point of view and that she's not the account owner. Copy and paste the text in Google Translate if you want to read it. Yesterday about 40 people showed up at her house wanting to beat her up and her dad was so furious. The mob left. I'm not sure if it was because of rage-dad or if he called the cops :)
The accused girl is 17 years old and she has left Gothenburg and is staying in an unknown city while this whole thing fades away.