Girl filed a false complaint

I met a girl 6 months ago, we became friends. One day I went to her room and we end up sleeping together. We laid the ground rules that we don't want any relationship, it'll be a friends with benefits type of relation, whenever one feel like not continuing it, one can ask other to stop. This continued for 20-25 days. After that, some misunderstanding happened, we used to wonder together after our classes, some fellow students started thinking that we are in a relationship and someone informed her senior. Her family was looking for her to get married and she had told me that earlier. She called me that night and started threatening me that if I have spread this that she is my girlfriend and because of this, if there happens any problem in her marriage, she will ruin my life. Next day, I talked to her, cleared her misunderstanding and stopped talking to her. Now it's 2 month to this incident. I have all the WhatsApp chat records, call recordings and our pics together. She is well connected with influential people like police officers and politicians. What do you think, how much I should fear from her threat?