I’m being blackmailed

Ok so I was talking to someone and it was inappropriate dirty talk I realized I didn’t like it so I told her I was done. She said if I stop talking to her she will send the screenshots to all my friends. It’s on instagram DM and I don’t know what to do. If my friends find out they won’t understand. I’m not into girls. I thought I would try something new but I don’t like it. And now I’m stuck. She’s following two of my bestest friends and so if I unfollow her or block her she’ll send them. Can I report her or something that’ll keep her from doing it? It’s all on instagram.