Really creepy experience in chat- what do do?

Hello ,

I was chatting with a girl who told me this:

" I love manipulating people. I love making them hate themselves
I find the pain entertaining
I love turning people against each other. I love pulling the strings without them ever knowing
And I feel, that if I was going to die. I'm going to make it spectacular
Perhaps I can go down in history as a psychopathI could start a suicide cult and create a mass suicide. Or I could gun down a school if I felt bored. I could watch another human starve to death or make it survive on the flesh of their loved ones
I'm not kind. But I try to be. I know I have to change my ways. Because I now realise that talking and thinking this way isn't okay in a society like ours
No nothing really has happened. And therapy can't fix me. They'll send me away to an asylum or put me on medication. I had you fooled didn't I? You thought I was a good person.There's nothing wrong with me. I simply have different morals from the restI'm not a danger to anyone. I haven't put it into action.I look like a saint to other people.I'm not broken, I'm not damaged. I simply think differentlyI'm not smart. I'm not a psychopath. I don't have the skills to pull it off. I know you think it's all really scary or creepy.But that's okay haha.And don't worry. I'm not going to hurt you or anyone else any time soon.Ahaha don't worry. I'm willing to play nice! I don't normally sound so mean or cruel.It's just fun watching people squirm when they see what goes through my head."

I got really scared that one day she could do something to herself or to others
..we wrote on kik...so not a forum were I could contact an admin. I am just afraid it could be my fault if one day something happens... Because I should have told...but I don't know how...I don't know her real name or anything.