So it sounds like you want some kind of "showdown" with her that is really all about you venting your pain at her. You want some dramatic "finale" where you basically let her know how rejected you feel. This is just another way of guilting her. This just prolongs the interpersonal drama.

Go ahead, if you think this satisfies some need you have. Maybe you are claiming this will give you "closure." It sounds to me more like an effort on your part to make her very uncomfortable.

Some friendships just fizzle out. It happens to everyone. Your connection with this woman has been fizzling out. She's not asking you to "piss off." She's never been hostile toward you and doesn't want to be even unpleasant. But she doesn't want to spend special time alone with you. You shouldn't expect her to. It would be inappropriate for her to do that. That's not friendship. That's "dating."

You need to let go. If calling her up, or texting her, and announcing that you are exiting from your connection with her is what you'd like to do, go ahead. Whatever helps you come to terms with reality -- do it. Free yourself from what has become an unhealthy obsession.

Make other connections with other people. Cultivate friendships where you can. Understand that some connections last and some don't. It can make us sad when a connection doesn't last. It's fine to grieve the loss. I've been through that myself. Sometimes you just have to close the book. The pain heals, if you let it.