How do I make it clear that I’m not interested in someone?

Good luck with that. If you figure out a way, let me know.

At this point I would say it's fair to be rude.

Sad for her. :( She probably doesn't realize how uncomfortable she's making you, and I imagine it's because of her past experiences. Sounds like she doesn't respect your boundaries, though, so that really sucks for you. I would only suggest you be as clear as possible with her, and if she really doesn't relent, file a restraining order.

Tell her again and don't smile or act friendly. Then...stop all communication. Be clear, be firm, and then be silent.

Tell her that you collect human teeth.

Has there been anything between you that would suggest to her you are attracted to her?

I am convinced you are lying too.

Ignoring works.

Ignore her

You cant because shes delousional

Wow, that's unfortunate. TRO ?

Fuck her best friend.

Fuck her sister.