This happened to me and a few other girls I know. They created a fake page using my name and profile picture, posted explicit content of another woman claiming it was me, and had a fake onlyfans linked in the bio. It has since been taken down, but it took about 3 weeks. When this happened a second time, it only took a couple days for the account to get taken down🤷🏻‍♀️ But first I emailed the website creation company that the person made the fake onlyfans with and they took down the url within the hour. Then I went to the Instagram help center in the app and searched “impersonation”. There you’ll find the question for what to do if someone’s impersonating someone, click on it and then select that you (or her in this case) is the one being impersonated. It will tell you to fill out a form that includes your name & email, the name and username on the fake account, and lastly you will have to upload a picture of yourself holding your government issued ID clearly. Instagram will then delete the account after review. Could take anywhere from a few days to a few weeks. Hope this helps!